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Awesome Crystal
!Awesome (https://awesome.re/badge.svg) (https://awesome.re)
A curated list of awesome Crystal code and resources. Inspired by awesome (https://github.com/sindresorhus/awesome) and awesome-awesomeness (https://github.com/bayandin/awesome-awesomeness).
The goal is to have projects mostly stable and useful for the community.
Search shards at shards.info (https://shards.info) or follow announcements Crystal ANN (https://crystal-ann.com) for more.
Contributions are welcome. Please take a quick look at the contribution guidelines (https://github.com/veelenga/awesome-crystal/blob/master/.github/CONTRIBUTING.md) first.
⟡ Awesome Crystal (#awesome-crystal)
⟡ Algorithms and Data structures (#algorithms-and-data-structures)
⟡ Blockchain (#blockchain)
⟡ C Bindings (#c-bindings)
⟡ Caching (#caching)
⟡ CLI Builders (#cli-builders)
⟡ CLI Utils (#cli-utils)
⟡ Code Analysis and Metrics (#code-analysis-and-metrics)
⟡ Compression (#compression)
⟡ Configuration (#configuration)
⟡ Converters (#converters)
⟡ Cryptography (#cryptography)
⟡ Data Formats (#data-formats)
⟡ Data Generators (#data-generators)
⟡ Database Drivers/Clients (#database-driversclients)
⟡ Database Tools (#database-tools)
⟡ Debugging (#debugging)
⟡ Dependency Injection (#dependency-injection)
⟡ Email (#email)
⟡ Environment Management (#environment-management)
⟡ Examples and funny stuff (#examples-and-funny-stuff)
⟡ Framework Components (#framework-components)
⟡ Game Development (#game-development)
⟡ GUI Development (#gui-development)
⟡ HTML Builders (#html-builders)
⟡ HTML/XML parsing (#htmlxml-parsing)
⟡ HTTP (#http)
⟡ Image Processing (#image-processing)
⟡ Implementations/Compilers (#implementationscompilers)
⟡ Internationalization (#internationalization)
⟡ Logging and monitoring (#logging-and-monitoring)
⟡ Machine Learning (#machine-learning)
⟡ Markdown/Text Processors (#markdowntext-processors)
⟡ Misc (#misc)
⟡ Network Protocols (#network-protocols)
⟡ Networking (#networking)
⟡ ORM/ODM Extensions (#ormodm-extensions)
⟡ Package Management (#package-management)
⟡ Processes and Threads (#processes-and-threads)
⟡ Project Generators (#project-generators)
⟡ Queues and Messaging (#queues-and-messaging)
⟡ Routing (#routing)
⟡ Scheduling (#scheduling)
⟡ Science and Data analysis (#science-and-data-analysis)
⟡ Search (#search)
⟡ Serverless Computing (#serverless-computing)
⟡ System (#system)
⟡ Task management (#task-management)
⟡ Template Engine (#template-engine)
⟡ Testing (#testing)
⟡ Third-party APIs (#third-party-apis)
⟡ Validation (#validation)
⟡ Web Frameworks (#web-frameworks)
⟡ Community (#community)
⟡ Unofficial (#unofficial)
⟡ Resources (#resources)
⟡ Official Documentation Translations (#official-documentation-translations)
⟡ Services and Apps (#services-and-apps)
⟡ Tools (#tools)
⟡ DevOps (#devops)
⟡ Editor Plugins (#editor-plugins)
⟡ LSP Language Server Protocol Implementations (#lsp-language-server-protocol-implementations)
⟡ Shell Plugins (#shell-plugins)
Algorithms and Data structures
⟡ bisect (https://github.com/spider-gazelle/bisect) - Inserting values into a sorted array
⟡ blurhash.cr (https://github.com/Sija/blurhash.cr) - BlurHash (https://github.com/woltapp/blurhash) implementation
⟡ crie (https://github.com/c910335/crie) - Compile-time Trie
⟡ CrOTP (https://github.com/philnash/crotp) - HOTP and TOTP implementation for two factor authentication
⟡ crystal-linked-list (https://github.com/abvdasker/crystal-linked-list) - Implementation of Linked List
⟡ crystaledge (https://github.com/unn4m3d/crystaledge) - A pure Vector Math library
⟡ crystalg (https://github.com/tobyapi/crystalg) - A Generic Algorithm Library
⟡ crystalline (https://github.com/jtomschroeder/crystalline) - A collection of containers and algorithms
⟡ csuuid (https://github.com/wyhaines/csuuid.cr) - A Chronologically Sortable UUID
⟡ edits.cr (https://github.com/tcrouch/edits.cr) - Collection of edit distance algorithms
⟡ fzy (https://github.com/hugopl/fzy) - A Crystal port of awesome Fzy project fuzzy finder algorithm
⟡ Goban (https://github.com/soya-daizu/goban) - A fast and efficient QR Code implementation
⟡ graphlb (https://github.com/mettuaditya/graphlb) - Collection of graph datastructure and algorithms
⟡ haversine (https://github.com/geocrystal/haversine) - An Implementation of the Haversine formula
⟡ HKDF (https://github.com/spider-gazelle/HKDF) - HMAC-based Extract-and-Expand Key Derivation Function rfc5869 (https://www.rfc-editor.org/rfc/rfc5869)
⟡ kd_tree (https://github.com/geocrystal/kd_tree) - An implementation of "K-Dimensional Tree" and "N-Nearest Neighbors"
⟡ ksuid.cr (https://github.com/Sija/ksuid.cr) - K-Sortable Globally Unique IDs
⟡ markov (https://github.com/mccallofthewild/markov) - Build Markov Chains and run Markov Processes
⟡ multiset.cr (https://github.com/tcrouch/multiset.cr) - Implementation of a multiset
⟡ named_information (https://github.com/spider-gazelle/named_information) - Naming Things with Hashes rfc6920 (https://datatracker.ietf.org/doc/html/rfc6920)
⟡ qr-code (https://github.com/spider-gazelle/qr-code) - QR Code generator
⟡ radix (https://github.com/luislavena/radix) - Radix Tree implementation
⟡ s2_cells (https://github.com/spider-gazelle/s2_cells) - S2 Geometry (https://s2geometry.io/devguide/s2cell_hierarchy.html) for spatial indexing
⟡ secure-remote-password (https://github.com/spider-gazelle/secure-remote-password) - SRP-6a protocol for authentication over an insecure network
⟡ SPAKE2+ (https://github.com/spider-gazelle/SPAKE2_plus) - Password Authenticated Key Exchange (PAKE) protocol, comparable to SRP-6a
⟡ splay_tree_map (https://github.com/wyhaines/splay_tree_map.cr) - Splay Tree implementation that conforms to the Hash ducktype
⟡ verhoeff (https://github.com/spider-gazelle/verhoeff) - Implementation of the Verhoeff checksum algorithm
Blockchain
⟡ Axentro (https://github.com/Axentro/Axentro) - A custom blockchain platform
⟡ Cocol (https://github.com/cocol-project/cocol) - A minimal blockchain testbed
⟡ secp256k1.cr (https://github.com/q9f/secp256k1.cr) - Elliptic curve used in the public-private-key cryptography
C bindings
⟡ augeas.cr (https://github.com/fernandes/augeas.cr) - Bindings for Augeas (https://augeas.net/)
⟡ clang.cr (https://github.com/crystal-lang/clang.cr) - Libclang bindings
⟡ crt.cr (https://github.com/maiha/crt.cr) - Bindings for libncursesw and crt
⟡ crystal-gsl (https://github.com/konovod/crystal-gsl) - Bindings for GNU Scientific Library (https://www.gnu.org/software/gsl/)
⟡ crystal-hunspell (https://github.com/mamantoha/crystal-hunspell) - Bindings for Hunspell (https://hunspell.github.io/)
⟡ duktape.cr (https://github.com/jessedoyle/duktape.cr) - Bindings for the Duktape (https://github.com/svaarala/duktape) javascript engine
⟡ fftw.cr (https://github.com/firejox/fftw.cr) - Bindings for FFTW (https://fftw.org/) library
⟡ gphoto2.cr (https://github.com/Sija/gphoto2.cr) - Bindings for the libgphoto2 (http://www.gphoto.org/) library
⟡ icu.cr (https://github.com/olbat/icu.cr) - Bindings for the ICU (http://site.icu-project.org/) library
⟡ libnotify.cr (https://github.com/splattael/libnotify.cr) - Bindings for Libnotify
⟡ nlopt.cr (https://github.com/konovod/nlopt.cr) - Bindings for NLOpt (https://nlopt.readthedocs.io/en/latest/)
⟡ pcap.cr (https://github.com/maiha/pcap.cr) - Bindings for libpcap
⟡ pledge.cr (https://github.com/chris-huxtable/pledge.cr) - Bindings for OpenBSD's pledge(2)
⟡ ssh2.cr (https://github.com/spider-gazelle/ssh2.cr) - Bindings for libssh2 library
⟡ syslog.cr (https://github.com/chris-huxtable/syslog.cr) - Bindings for syslog
⟡ v4l2.cr (https://github.com/spider-gazelle/v4l2.cr) - Bindings for Video4Linux2 (https://en.wikipedia.org/wiki/Video4Linux)
⟡ wasmer-crystal (https://github.com/naqvis/wasmer-crystal) - Bindings for the wasmer WebAssembly runtime
⟡ win32cr (https://github.com/mjblack/win32cr) - Bindings for Win32 API
⟡ x_do.cr (https://github.com/woodruffw/x_do.cr) - Bindings for libxdo (xdotool (https://github.com/jordansissel/xdotool))
Caching
⟡ crystal-memcached (https://github.com/comandeo/crystal-memcached) - Implementation of a memcached client
CLI Builders
⟡ admiral (https://github.com/jwaldrip/admiral.cr) - A robust DSL for writing command line interfaces
⟡ Athena Console (https://github.com/athena-framework/console) - Allows for the creation of CLI based commands
⟡ clicr (https://github.com/j8r/clicr) - A simple declarative command line interface builder
⟡ clim (https://github.com/at-grandpa/clim) - Slim command line interface builder
⟡ Cling (https://github.com/devnote-dev/cling) - A modular, non-macro-based command line interface library
⟡ commander (https://github.com/mrrooijen/commander) - Command-line interface builder
⟡ Keimeno (https://github.com/robacarp/keimeno) - A lightweight text user interface library in Crystal
⟡ OptionParser (https://crystal-lang.org/api/OptionParser.html) - command-line options processing (Crystal stdlib)
⟡ Phreak (https://github.com/shinzlet/phreak) - A highly flexible Crystal CLI builder in the style of OptionParser
CLI Utils
⟡ climate (https://github.com/Sija/climate.cr) - Tiny tool to make your CLI output 🌈 coloured
⟡ coin (https://github.com/caian-org/coin) - Command-line application that performs currency conversion via the Fixer API (https://fixer.io)
⟡ cride (https://github.com/j8r/cride) - A light CLI text editor/IDE
⟡ git-repository (https://github.com/place-labs/git-repository) - A git cli wrapper querying and cloning remote repositories with minimal data transfer
⟡ hetzner-k3s (https://github.com/vitobotta/hetzner-k3s) - A CLI tool to quickly create and manage Kubernetes clusters in Hetzner Cloud
⟡ lff (https://github.com/mkdika/lff-cr) - Simple and straightforward large files finder utility in command line
⟡ meet (https://github.com/ryanprior/meet) - Start a jitsi meeting quickly from the comfort of your command line
⟡ oq (https://github.com/Blacksmoke16/oq) - A performant, and portable jq wrapper to facilitate the consumption and output of formats other than JSON; using jq
(https://github.com/stedolan/jq) filters to transform the data
⟡ progress_bar.cr (https://github.com/TPei/progress_bar.cr) - A simple and customizable progress bar
⟡ tablo (https://github.com/hutou/tablo) - A flexible terminal table generator
⟡ tallboy (https://github.com/epoch/tallboy) - Generate ASCII character tables with support for spanning cells over multiple columns
Code Analysis and Metrics
⟡ ameba (https://github.com/crystal-ameba/ameba) - A static code analysis tool
⟡ linguist.cr (https://github.com/microgit-com/linguist.cr) - Using multiple ways to find programming language used in files, based on Github's Linguist
Compression
⟡ Crystar (https://github.com/naqvis/crystar) - Readers and writers of Tar archive format
⟡ Gzip (https://crystal-lang.org/api/Compress/Gzip.html) - readers and writers of gzip format (Crystal stdlib)
⟡ polylines.cr (https://github.com/BuonOmo/polylines.cr) — compression of series of coordinates
⟡ snappy (https://github.com/naqvis/snappy) - Snappy compression format reader/writer for Crystal
⟡ Zip (https://crystal-lang.org/api/Compress/Zip.html) - readers and writers of zip format (Crystal stdlib)
⟡ Zlib (https://crystal-lang.org/api/Compress/Zlib.html) - readers and writers of zlib format (Crystal stdlib)
⟡ zstd.cr (https://github.com/didactic-drunk/zstd.cr) - Bindings for Zstandard (https://github.com/facebook/zstd) compression library
Configuration
⟡ cr-dotenv (https://github.com/gdotdesign/cr-dotenv) - Loads .env file
⟡ Envy (https://github.com/grottopress/envy) - Load environment variables from YAML
⟡ envyable (https://github.com/philnash/envyable.cr) - A simple YAML to ENV config loader
⟡ habitat (https://github.com/luckyframework/habitat) - Type safe configuration for your classes and modules
⟡ totem (https://github.com/icyleaf/totem) - Load and parse a configuration in JSON, YAML, dotenv formats
Converters
⟡ base62.cr (https://github.com/Sija/base62.cr) - Base62 encoder/decoder, well suited for url-shortening
⟡ crunits (https://github.com/spider-gazelle/crunits) - Tool for converting units of measure (miles to kilometers, celsius to fahrenheit etc)
⟡ money (https://github.com/crystal-money/money) - Handling money and currency conversion with ease (almost complete port of RubyMoney (https://github.com/RubyMoney/money))
⟡ sass.cr (https://github.com/straight-shoota/sass.cr) - Compile SASS/SCSS to CSS (libsass (https://github.com/sass/libsass/) binding)
Cryptography
⟡ cmac (https://github.com/spider-gazelle/cmac) - Crystal implementation of Cipher-based Message Authentication Code (CMAC)
⟡ ed25519 (https://github.com/spider-gazelle/ed25519) - the Ed25519 elliptic curve public-key signature system
described in RFC 8032
⟡ monocypher.cr (https://github.com/konovod/monocypher.cr) - Crystal wrapper for the Monocypher crypto library
⟡ sodium.cr (https://github.com/didactic-drunk/sodium.cr) - Crystal wrapper for the libsodium crypto API
Data Formats
⟡ BinData (https://github.com/spider-gazelle/bindata) - Binary data parser helper with an ASN.1 (https://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One) parser
⟡ config.cr (https://github.com/chris-huxtable/config.cr) - Easy to use configuration format parser
⟡ crinder (https://github.com/c910335/crinder) - Class based json renderer
⟡ Crystalizer (https://github.com/j8r/crystalizer) - (De)serialize any Crystal object; supporting JSON, YAML, and Byte formats out of the box
⟡ CSV (https://crystal-lang.org/api/CSV.html) - parsing and generating for comma-separated values (Crystal stdlib)
⟡ front_matter.cr (https://github.com/chris-huxtable/front_matter.cr) - Separates a files front matter from its content
⟡ geoip2.cr (https://github.com/delef/geoip2.cr) - GeoIP2 reader
⟡ HAR (https://github.com/NeuraLegion/har) - HAR (HTTP Archive) parser
⟡ INI (https://crystal-lang.org/api/INI.html) - INI file parser (Crystal stdlib)
⟡ JSON (https://crystal-lang.org/api/JSON.html) - parsing and generating JSON documents (Crystal stdlib)
⟡ json-schema (https://github.com/spider-gazelle/json-schema) - convert JSON serializable classes into a JSON Schema (https://json-schema.org/) representation
⟡ JSON::OnSteroids (https://github.com/anykeyh/json_on_steroids) - handle and mutate JSON document easily
⟡ maxminddb.cr (https://github.com/delef/maxminddb.cr) - MaxMindDB reader
⟡ toml.cr (https://github.com/crystal-community/toml.cr) - TOML parser
⟡ XML (https://crystal-lang.org/api/XML.html) - parsing and generating XML documents (Crystal stdlib)
⟡ YAML (https://crystal-lang.org/api/YAML.html) - parsing and generating YAML documents (Crystal stdlib)
Data Generators
⟡ faker (https://github.com/askn/faker) - A library for generating fake data
⟡ hashids.cr (https://github.com/splattael/hashids.cr) - A library to generate YouTube-like ids from one or many numbers
⟡ prime (https://github.com/wontruefree/prime) - A prime number generator
Database Drivers/Clients
⟡ couchdb.cr (https://github.com/TechMagister/couchdb.cr) - CouchDB client
⟡ cryomongo (https://github.com/elbywan/cryomongo) - MongoDB driver
⟡ crystal-db (https://github.com/crystal-lang/crystal-db) - Common db api
⟡ crystal-ldap (https://github.com/spider-gazelle/crystal-ldap) - LDAP client
⟡ crystal-mysql (https://github.com/crystal-lang/crystal-mysql) - MySQL connector for Crystal
⟡ crystal-pg (https://github.com/will/crystal-pg) - A Postgres driver
⟡ crystal-redis (https://github.com/stefanwille/crystal-redis) - Full featured Redis client
⟡ crystal-rethinkdb (https://github.com/kingsleyh/crystal-rethinkdb) - Driver for RethinkDB / RebirthDB
⟡ crystal-sqlite3 (https://github.com/crystal-lang/crystal-sqlite3) - SQLite3 bindings
⟡ leveldb (https://github.com/crystal-community/leveldb) - Crystal bindings for LevelDB
⟡ rocksdb.cr (https://github.com/maiha/rocksdb.cr) - RocksDB client
⟡ surrealdb.cr (https://github.com/yorci/surrealdb.cr) - Unoffical SurrealDB HTTP & Websocket Client
Database Tools
⟡ migrate (https://github.com/vladfaust/migrate.cr) - A simpler database migration tool with transactions
Debugging
⟡ backtracer.cr (https://github.com/Sija/backtracer.cr) - Shard aiming to assist with parsing backtraces into a structured form
⟡ debug.cr (https://github.com/Sija/debug.cr) - debug!(…) macro for pp-style debugging
Dependency Injection
⟡ Athena Dependency Injection (https://github.com/athena-framework/dependency-injection) - Robust dependency injection service container framework
⟡ Crystal-DI (https://github.com/funk-yourself/crystal-di) - Lightweight DI Container
⟡ HardWire (https://github.com/jerometwell/hardwire) - A compile-time non-intrusive dependency injection system
⟡ syringe (https://github.com/Bonemind/syringe) - A simple and basic dependency injection shard for crystal
Email
⟡ carbon (https://github.com/luckyframework/carbon) - Fun, testable, and adapter-based email library
⟡ crystal-email (https://github.com/arcage/crystal-email) - Simple e-mail sending library
⟡ CrystalEmail (https://git.sceptique.eu/Sceptique/CrystalEmail) - A RFC compliant Email validator
⟡ sendgrid.cr (https://github.com/dlanileonardo/sendgrid.cr) - Simple Sendgrid Client
Environment Management
⟡ asdf-crystal (https://github.com/marciogm/asdf-crystal) - Plugin for asdf version manager
⟡ crenv (https://github.com/crenv/crenv) - Crystal version manager
⟡ rcm.cr (https://github.com/maiha/rcm.cr) - Redis Cluster Manager
Examples and funny stuff
⟡ blackjack-cr (https://github.com/gdonald/blackjack-cr) - Console Blackjack
⟡ crystal-patterns (https://github.com/crystal-community/crystal-patterns) - Examples of GOF patters
⟡ crystalworld (https://github.com/vladfaust/crystalworld) - realworld.io (https://realworld.io) back-end API implementation
⟡ exercism-crystal (https://github.com/exercism/crystal) - Exercism exercises
⟡ try.cr (https://github.com/maiha/try.cr) - Try monad
Framework Components
⟡ Athena Event Dispatcher (https://github.com/athena-framework/event-dispatcher) - A Mediator and Observer pattern event library
⟡ Athena Negotiation (https://github.com/athena-framework/negotiation) - Framework agnostic content negotiation library
⟡ device_detector (https://github.com/creadone/device_detector) - Shard for detect device by user agent string
⟡ Exception Page (https://github.com/crystal-loot/exception_page) - An exceptional exception page for Crystal web libraries and frameworks
⟡ graphql (https://github.com/graphql-crystal/graphql) - Type-safe GraphQL (http://graphql.org) server implementation
⟡ graphql-crystal (https://github.com/ziprandom/graphql-crystal) - GraphQL (http://graphql.org) implementation
⟡ kemal-session (https://github.com/kemalcr/kemal-session) - Session handler for Kemal
⟡ mochi (https://github.com/awcrotwell/mochi) - Authentication shard inspired by Devise supporting: Authenticable, Confirmable, Invitable & more
⟡ motion.cr (https://github.com/awcrotwell/motion.cr) - Object oriented frontend library for Amber
⟡ multi-auth (https://github.com/msa7/multi_auth) - Standardized multi-provider OAuth2 authentication (inspired by omniauth)
⟡ praetorian (https://github.com/ilanusse/praetorian) - Minimalist authorization library inspired by Pundit
⟡ Shield (https://github.com/grottopress/shield) - Comprehensive security for Lucky framework
⟡ shrine.cr (https://github.com/jetrockets/shrine.cr) - File Attachment toolkit for Crystal applications. Heavily inspired by Shrine for Ruby
⟡ tourmaline (https://github.com/protoncr/tourmaline) - Telegram bot framework with an API loosely based on telegraf.js (https://telegraf.js.org/)
Game Development
⟡ CrSFML (https://github.com/oprypin/crsfml) - Bindings to SFML (https://www.sfml-dev.org/) multimedia/game library
⟡ crystal-chipmunk (https://github.com/oprypin/crystal-chipmunk) - Bindings to Chipmunk (http://chipmunk-physics.net/), a fast and lightweight 2D game physics library
⟡ crystal-imgui-sfml (https://github.com/oprypin/crystal-imgui-sfml) - Bindings to integrate Dear ImGui (https://github.com/ocornut/imgui) into an SFML (https://www.sfml-dev.org/) project
⟡ entitas.cr (https://github.com/spoved/entitas.cr) - A Entity Component System Framework for Crystal
⟡ MyECS (https://github.com/konovod/myecs) - A Sparse Entity Component System Framework for Crystal
⟡ Raylib-cr (https://github.com/sol-vin/raylib-cr) - Direct bindings to Raylib (https://raylib.com), which supports Linux, Windows, and Mac
⟡ SDL-Crystal-Bindings (https://github.com/Hadeweka/SDL-Crystal-Bindings) - Direct (unsafe) bindings to SDL2 (https://www.libsdl.org/), intended for writing own game libraries
GUI Development
⟡ crystal-imgui (https://github.com/oprypin/crystal-imgui) - Bindings to Dear ImGui (https://github.com/ocornut/imgui), an immediate-mode graphical UI library
⟡ GTK4.cr (https://github.com/hugopl/gtk4.cr) - Bindings for GTK4 (https://docs.gtk.org/gtk4/overview.html) with Crystalized API
⟡ Iu (https://github.com/grkek/iu) - UI framework based on the Fusion/libui.cr (https://github.com/Fusion/libui.cr) library, with custom elements and modified bindings from
hedron-crystal/hedron (https://github.com/hedron-crystal/hedron)
⟡ Ultimate GTK4 Crystal Guide (https://ultimate-gtk4-crystal-guide.geopjr.dev/) - Learn how to create premium GTK4 apps in Crystal
HTML Builders
⟡ blueprint (https://github.com/gunbolt/blueprint) - Write reusable and testable HTML templates in plain Crystal
⟡ form_builder.cr (https://github.com/westonganger/form_builder.cr) - Dead simple HTML form builder for Crystal with built-in support for many popular UI libraries such as Bootstrap
⟡ to_html (https://github.com/sbsoftware/to_html.cr) - The fastest HTML builder engine for Crystal
⟡ Water (https://github.com/shootingfly/water) - A library for writing HTML in plain Crystal
HTML/XML Parsing
⟡ docx_cr_converter (https://github.com/aristotelesbr/docx_cr_converter) - parse DOCX Word
⟡ myhtml (https://github.com/kostya/myhtml) - Fast HTML5 Parser that includes CSS selectors
HTTP
⟡ Cable (https://github.com/cable-cr/cable) - An ActionCable "port" to Crystal, framework agnostic, 100% compatible with the ActionCable JS Client
⟡ cossack (https://github.com/crystal-community/cossack) - Simple flexible HTTP client
⟡ crest (https://github.com/mamantoha/crest) - Simple HTTP and REST client, inspired by the Ruby's RestClient gem
⟡ crul (https://github.com/porras/crul) - Command line HTTP client
⟡ digest-auth (https://github.com/spider-gazelle/digest-auth) - Digest authentication
⟡ halite (https://github.com/icyleaf/halite) - Crystal HTTP Requests with a chainable REST API, built-in sessions and loggers
⟡ http-multiserver.cr (https://github.com/vladfaust/http-multiserver.cr) - Mounting multiple servers via routes (a.k.a. URL mapping)
⟡ http-params-serializable (https://github.com/vladfaust/http-params-serializable) - HTTP params (de)serialization, applicable to URL queries and URL-encoded forms
⟡ http-protection (https://github.com/rogeriozambon/http-protection) - Protection against typical web attacks
⟡ http2 (https://github.com/ysbaddaden/http2) - HTTP/2 Protocol Implementation
⟡ HTTP::Client (https://crystal-lang.org/api/HTTP/Client.html) - HTTP client (Crystal stdlib)
⟡ HTTP::Server (https://crystal-lang.org/api/HTTP/Server.html) - HTTP server (Crystal stdlib)
⟡ HTTP::WebSocket (https://crystal-lang.org/api/HTTP/WebSocket.html) - HTTP WebSocket client (Crystal stdlib)
⟡ link-header (https://github.com/spider-gazelle/link-header) - HTTP Link Header Parser
⟡ ntlm (https://github.com/spider-gazelle/ntlm) - NTLM authentication
⟡ proxy-fetcher.cr (https://github.com/nbulaj/proxy-fetcher.cr) - Proxy lists fetching & validating library
⟡ sse.cr (https://github.com/y2k2mt/sse.cr) - Server-Sent Events (https://html.spec.whatwg.org/multipage/server-sent-events.html) client
Image processing
⟡ celestine (https://github.com/celestinecr/celestine) - Create SVG images using a DSL
⟡ ffmpeg (https://github.com/spider-gazelle/ffmpeg) - FFmpeg bindings that works with StumpyPNG to extract frames
⟡ Pluto (https://github.com/phenopolis/pluto) - A fast and convenient image processing library
⟡ stumpy_png (https://github.com/stumpycr/stumpy_png) - Read and write PNG images
Implementations/Compilers
⟡ charly (https://github.com/charly-lang) - Charly Programming Language
⟡ cltk (https://github.com/ziprandom/cltk) - A crystal port of the Ruby Language Toolkit
⟡ crisp (https://github.com/rhysd/Crisp) - Lisp dialect implemented with Crystal
⟡ LinCAS-lang (https://github.com/LinCAS-lang) - A programming language for scientific computation
⟡ mint-lang (https://github.com/mint-lang/mint) - A refreshing programming language for the front-end web
⟡ myst-lang (https://github.com/myst-lang/) - A practical, dynamic language designed to be written and understood as easily and efficiently as possible
⟡ novika (https://github.com/novika-lang/novika) - A free-form, moldable, interpreted programming language
⟡ runic-lang (https://github.com/runic-lang) - In-design toy language
Internationalization
⟡ crystal-i18n (https://github.com/crystal-i18n/i18n) - An internationalization library inspired by Ruby-I18n
⟡ i18n.cr (https://github.com/vladfaust/i18n.cr) - Internationalization shard
⟡ Lens (https://github.com/syeopite/lens) - A multiformat internationalization (i18n) shard for Crystal. Supports Gettext, Ruby YAML, etc.
⟡ Rosetta (https://github.com/wout/rosetta) - A blazing fast internationalization (i18n) library with compile-time key lookup supporting YAML and JSON formats
Logging and monitoring
⟡ crafana (https://github.com/spoved/crafana.cr) - A Grafana (https://grafana.com/) library to help autogenerate dashboards
⟡ fiber_metrics.cr (https://github.com/didactic-drunk/fiber_metrics.cr) - Track run time, wait time, or memory allocations per Fiber, method or block
⟡ Log (https://crystal-lang.org/api/Log.html) - logging utility (Crystal stdlib)
⟡ statsd.cr (https://github.com/miketheman/statsd.cr) - Statsd (https://github.com/etsy/statsd) client library
Machine Learning
⟡ ai4cr (https://github.com/drhuffman12/ai4cr) - Artificial Intelligence (based on https://github.com/SergioFierens/ai4r)
⟡ Cadmium (https://github.com/cadmiumcr/cadmium) - NLP library based heavily on natural (https://github.com/NaturalNode/natural)
⟡ crystal-fann (https://github.com/NeuraLegion/crystal-fann) - FANN (Fast Artifical Neural Network) binding
⟡ mxnet.cr (https://github.com/toddsundsted/mxnet.cr) - Bindings for MXNet (https://mxnet.incubator.apache.org/)
⟡ shainet (https://github.com/NeuraLegion/shainet) - SHAInet (Neural Network in pure crystal)
Markdown/Text Processors
⟡ cr-cmark-gfm (https://github.com/amauryt/cr-cmark-gfm) - Crystal C bindings for cmark-gfm to work with Commonmark and Github Flavored Markdown
⟡ markd (https://github.com/icyleaf/markd) - Yet another markdown parser built for speed, Compliant to CommonMark specification
Misc
⟡ aasm.cr (https://github.com/veelenga/aasm.cr) - Easy to use finite state machine for Crystal classes
⟡ any_hash.cr (https://github.com/Sija/any_hash.cr) - Recursive Hash with better JSON::Any included
⟡ anyolite (https://github.com/Anyolite/anyolite) - Full mruby interpreter with simple bindings, allowing for easy scripting support in projects
⟡ burocracia.cr (https://github.com/vinibrsl/burocracia.cr) - burocracia.cr the dependecyless shard to validate, generate and format Brazilian burocracias such as CPF, CNPJ and CEP
⟡ callbacks (https://github.com/vladfaust/callbacks.cr) - Expressive callbacks module
⟡ circuit_breaker (https://github.com/TPei/circuit_breaker) - Implementation of the circuit breaker pattern
⟡ CrSignals (https://github.com/firejox/CrSignals) - Signals/slots notification library
⟡ crystal-binary_parser (https://github.com/DanSnow/crystal-binary_parser) - Binary parser
⟡ crystal-web-framework-stars (https://github.com/isaced/crystal-web-framework-stars) - Web frameworks for Crystal, most starred on Github
⟡ crz (https://github.com/dhruvrajvanshi/crz) - Functional programming library
⟡ defined (https://github.com/wyhaines/defined.cr) - macros for conditional compilation based on constant definitions, version requirements, or environment variable settings
⟡ emoji.cr (https://github.com/veelenga/emoji.cr) - Emoji library
⟡ gphoto2-web.cr (https://github.com/Sija/gphoto2-web.cr) - Web API for libgphoto2
⟡ immutable (https://github.com/lucaong/immutable) - Implementation of thread-safe, persistent, immutable collections
⟡ iterm2 (https://github.com/toddsundsted/iterm2) - Display images within the terminal using the ITerm2 Inline Images Protocol
⟡ monads (https://github.com/alex-lairan/monads) - Monad implementation
⟡ observable (https://github.com/TPei/observable) - Implementation of the observer pattern
⟡ pinger (https://github.com/spider-gazelle/pinger) - Ping IP addresses and DNS entries without requiring sudo
⟡ port_midi (https://github.com/jimm/crystal_port_midi) - Crystal C bindings for the PortMIDI cross-platform MIDI I/O library
⟡ retriable.cr (https://github.com/Sija/retriable.cr) - Simple DSL to retry failed code blocks
⟡ serf-handler.cr (https://github.com/wyhaines/serf-handler.cr) - Framework for building Serf handlers, with a suite of useful builtin capabilities
⟡ simple_retry (https://github.com/spider-gazelle/simple_retry) - Simple tool for retrying failed code blocks
⟡ sslscan.cr (https://github.com/NeuraLegion/sslscan.cr) - Crystal shard wrapping the rbsec/sslscan utility
⟡ version_tools (https://github.com/anicholson/crystal-version-tools) - Version-dependent behaviour, specified at compile-time
⟡ wafalyzer (https://github.com/NeuraLegion/wafalyzer) - Web Application Firewall (WAF) Detector - shard + cli
⟡ zaru_crystal (https://github.com/szTheory/zaru_crystal) - Filename sanitization
Network Protocols
⟡ amqp-client.cr (https://github.com/cloudamqp/amqp-client.cr) - AMQP 0-9.1, a messaging protocol, implemented by eg. RabbitMQ
⟡ connect-proxy (https://github.com/spider-gazelle/connect-proxy) - Connect method style of HTTP tunnelling / HTTP proxy
⟡ cr-xmpp (https://github.com/naqvis/cr-xmpp) - XMPP/Jabber Library
⟡ Crirc (https://github.com/Meoowww/Crirc) - IRC protocol implementation (Client, Server, Bots)
⟡ crystal-bacnet (https://github.com/spider-gazelle/crystal-bacnet) - BACnet protocol implementation with BACnet/IP client
⟡ crystal-dns (https://gitlab.com/jgillich/crystal-dns) - DNS protocol implementation and resolver
⟡ crystal-json-socket (https://github.com/foi/crystal-json-socket) - JSON-socket client & server implementation. Inspired by and compatible with node-json-socket
(https://github.com/sebastianseilund/node-json-socket/) and ruby-json-socket (https://github.com/foi/ruby-json-socket)
⟡ crystal-mqtt (https://github.com/spider-gazelle/crystal-mqtt) - A MQTT client
⟡ crystal-snmp (https://github.com/spider-gazelle/crystal-snmp) - An SNMP implementation with version 1, 2c and 3 support
⟡ fast_irc.cr (https://github.com/RX14/fast_irc.cr) - Fast IRC parser/generator
⟡ jwt (https://github.com/crystal-community/jwt) - Implementation of JWT (JSON Web Token)
⟡ mDNS (https://github.com/spider-gazelle/mdns) - DNS Service Discovery and multicast DNS
⟡ mqtt-client.cr (https://github.com/84codes/mqtt-client.cr) - A fast and lightweight MQTT client
⟡ msgpack-crystal (https://github.com/crystal-community/msgpack-crystal) - MessagePack library
⟡ OAuth (https://crystal-lang.org/api/OAuth.html) - OAuth consumer (Crystal stdlib)
⟡ OAuth2 (https://crystal-lang.org/api/OAuth2.html) - OAuth2 client (Crystal stdlib)
⟡ OpenSSL (https://crystal-lang.org/api/OpenSSL.html) - bindings to libssl (Crystal stdlib)
⟡ simple_rpc (https://github.com/kostya/simple_rpc) - RPC Server and Client for Crystal. Implements msgpack-rpc protocol
⟡ stomp (https://github.com/spider-gazelle/stomp) - STOMP protocol
⟡ telnet.cr (https://github.com/spider-gazelle/telnet.cr) - Telnet protocol
⟡ transfer_more (https://git.sceptique.eu/Sceptique/transfer_more) - Clone of transfer.sh to uploads files
Networking
⟡ ipaddress.cr (https://github.com/Sija/ipaddress.cr) - Library to handle IPv4 and IPv6 addresses
⟡ mac-address (https://github.com/automatico/mac-address) - Library for working with MAC addresses
ORM/ODM Extensions
⟡ avram (https://github.com/luckyframework/avram) - A database wrapper for reading, writing, and migrating Postgres databases
⟡ clear (https://github.com/anykeyh/clear) - ORM specialized to PostgreSQL only but with advanced features
⟡ crecto (https://github.com/Crecto/crecto) - Database wrapper, based on Ecto
⟡ granite (https://github.com/amberframework/granite) - ORM for Postgres, Mysql, Sqlite
⟡ jennifer.cr (https://github.com/imdrasil/jennifer.cr) - Active Record pattern implementation with flexible query chainable builder and migration system
⟡ rethinkdb-orm (https://github.com/spider-gazelle/rethinkdb-orm) - ORM for RethinkDB / RebirthDB
Package Management
⟡ shards (https://github.com/crystal-lang/shards) - Dependency manager for the Crystal
Processes and Threads
⟡ await_async (https://github.com/anykeyh/await_async) - Add keywords await & async in Crystal Lang
⟡ concurrent.cr (https://github.com/didactic-drunk/concurrent.cr) - Simplified concurrency using streams/pipelines, waitgroups, semaphores, smores and more
⟡ neph (https://github.com/tbrand/neph) - A modern command line job processor that can execute jobs concurrently
⟡ promise (https://github.com/spider-gazelle/promise) - A Promise implementation with type inference
⟡ werk (https://github.com/marghidanu/werk) - Dead simple task runner with concurrent support, ideal for local CI
Project Generators
⟡ crystal_lib (https://github.com/crystal-lang/crystal_lib) - Automatic binding generator for native libraries
⟡ fez (https://github.com/jwoertink/fez) - A Kemal application generator
⟡ libgen (https://github.com/olbat/libgen) - Automatic bindings generator configured using JSON/YAML files
Queues and Messaging
⟡ crafka (https://github.com/BT-OpenSource/crafka) - Apache Kafka library utilizing librdkafka
⟡ mosquito (https://github.com/mosquito-cr/mosquito/) - Redis backed periodic and ad hoc job processing
⟡ NATS.io (https://github.com/nats-io/nats.cr) - NATS client
⟡ sidekiq.cr (https://github.com/mperham/sidekiq.cr) - Simple, efficient job processing
Routing
⟡ orion (https://github.com/obsidian/orion) - A minimal, rails-esque routing library
⟡ router.cr (https://github.com/tbrand/router.cr) - Minimum but powerful http router for HTTP::Server
Scheduling
⟡ crystime (https://gitlab.com/crystallabs/crystime) - Advanced time, calendar, schedule, and remind library
⟡ schedule.cr (https://github.com/hugoabonizio/schedule.cr) - Run periodic tasks
⟡ tasker (https://github.com/spider-gazelle/tasker) - A high precision scheduler including timezone aware cron jobs
Science and Data analysis
⟡ alea (https://github.com/nin93/alea) - Repeatable sampling, CDF and other utilities to work with probability distributions
⟡ ishi (https://github.com/toddsundsted/ishi) - Graph plotting package with a small API and sensible defaults powered by gnuplot
⟡ linalg (https://github.com/konovod/linalg) - Linear algebra library inspired by MATLAB and SciPy.linalg
⟡ num.cr (https://github.com/crystal-data/num.cr) - Numerical computing library supporting N-Dimensional data
⟡ predict.cr (https://github.com/RX14/predict.cr) - Satellite prediction library using the sgp4 model
⟡ quartz (https://github.com/RomainFranceschini/quartz) - Modeling and simulation framework
Search
⟡ hermes (https://github.com/imdrasil/hermes.cr) - Data Mapper pattern implementation for ElastiSearch
Serverless Computing
⟡ crystal_openfaas (https://github.com/TPei/crystal_openfaas/) - Template to enable crystal as first class citizens in OpenFaaS
⟡ secrets-env (https://github.com/spider-gazelle/secrets-env) - Extends ENV module to read values injected by docker / kubernetes secrets and other orchestration tools
System
⟡ baked_file_system (https://github.com/schovi/baked_file_system) - Virtual file system implementation
⟡ hardware (https://github.com/crystal-community/hardware) - Get CPU, Memory and Network informations of the running OS and its processes
Task management
⟡ cake (https://github.com/axvm/cake) - Production-ready Make-like utility tool
⟡ sam (https://github.com/imdrasil/sam.cr) - Another one Rake-like task manager with namespacing and arguments system
Template Engine
⟡ crinja (https://github.com/straight-shoota/crinja) - An implementation of the Jinja2 template engine (http://jinja.pocoo.org/)
⟡ crustache (https://github.com/MakeNowJust/crustache) - {{Mustache}} (https://mustache.github.io) for Crystal
⟡ ECR (Embedded Crystal) (https://crystal-lang.org/api/ECR.html) - compile time template language which uses plain crystal expressions (Crystal stdlib)
⟡ Jbuilder (https://github.com/shootingfly/jbuilder) - Generate JSON objects with a Builder-style DSL, inspired by jbuilder
⟡ Kilt (https://github.com/jeromegn/kilt) - Abstraction layer for template engines
⟡ Slang (https://github.com/jeromegn/slang) - Lightweight, terse, templating language inspired by Ruby's Slim
⟡ teeplate (https://github.com/mosop/teeplate) - A library for rendering multiple template files
Testing
⟡ Athena Spec (https://github.com/athena-framework/spec) - Common/helpful Spec (https://crystal-lang.org/api/Spec.html) compliant testing utilities
⟡ crotest (https://github.com/emancu/crotest) - A tiny and simple test framework
⟡ crytic (https://github.com/hanneskaeufler/crytic) - Mutation testing framework
⟡ hashr (https://github.com/crystal-china/hashr) - A tiny class makes test on JSON response easier
⟡ LuckyFlow (https://github.com/luckyframework/lucky_flow) - Automated browser tests similar to Capybara
⟡ mass-spec (https://github.com/c910335/mass-spec) - Web API testing library
⟡ microtest (https://github.com/Ragmaanir/microtest) - Small opinionated testing library focusing on power asserts
⟡ minitest.cr (https://github.com/ysbaddaden/minitest.cr) - Library for unit tests and assertions
⟡ mocks.cr (https://github.com/waterlink/mocks.cr) - Mocking library for Crystal
⟡ Spec (https://crystal-lang.org/api/Spec.html) - spec framework (Crystal stdlib)
⟡ spectator (https://gitlab.com/arctic-fox/spectator) - Feature rich spec framework that uses the modern expect syntax
⟡ timecop.cr (https://github.com/crystal-community/timecop.cr) - Library for mocking with Time.now. Inspired by the timecop ruby gem (https://github.com/travisjeffery/timecop)
⟡ vcr (https://github.com/spoved/vcr.cr) - A HTTP capture and replay implementation for crystal
⟡ webdriver_pump (https://github.com/bwilczek/webdriver_pump) - Page Object library. Inspired by Ruby's WatirPump (https://github.com/bwilczek/watir_pump)
⟡ webmock.cr (https://github.com/manastech/webmock.cr) - Library for stubbing HTTP::Client requests
Third-party APIs
⟡ amazonite (https://github.com/rjnienaber/amazonite) - An unofficial SDK supporting popular AWS APIs
⟡ aws-signer.cr (https://github.com/beanieboi/aws-signer.cr) - This library signs your HTTP requests using AWS v4
⟡ awscr-s3 (https://github.com/taylorfinnell/awscr-s3) - AWS S3 interface
⟡ awscr-signer (https://github.com/taylorfinnell/awscr-signer) - Sign HTTP::Request objects and generate presigned post forms
⟡ crystal-consul (https://github.com/rogerwelin/crystal-consul) - Consul API client
⟡ crystal-darksky (https://github.com/sb89/crystal-darksky) - Wrapper for the Dark Sky (https://darksky.net) API
⟡ crystal-swapi (https://github.com/sb89/crystal-swapi) - Star Wars API (SWAPI) wrapper
⟡ crystal_slack (https://github.com/manastech/crystal_slack) - A tool that parses Slack slash commands or send incoming web hooks
⟡ GDAX (https://github.com/mccallofthewild/gdax) - GDAX REST and WebSocket API Wrapper with request signing
⟡ gitlab.cr (https://github.com/icyleaf/gitlab.cr) - GitLab API wrapper
⟡ google (https://github.com/PlaceOS/google) - Google API wrapper
⟡ host_meta (https://github.com/toddsundsted/host_meta) - A Web Host Metadata (https://tools.ietf.org/html/rfc6415) client
⟡ kube-client.cr (https://github.com/spoved/kube-client.cr) - Kubernetes API Client
⟡ mixpanel-crystal (https://github.com/petoem/mixpanel-crystal) - A library for sending events to Mixpanel
⟡ mollie.cr (https://github.com/wout/mollie.cr) - Mollie (https://www.mollie.com/en/) Payments API wrapper (Creditcard, PayPal, Apple Pay, Sofort, Klarna, ...)
⟡ office365 (https://github.com/PlaceOS/office365) - Microsoft Graph API wrapper
⟡ pinboard.cr (https://github.com/oz/pinboard.cr) - Pinboard (https://pinboard.in) API
⟡ raven.cr (https://github.com/sija/raven.cr) - Raven is a client for Sentry (https://github.com/getsentry/sentry)
⟡ stripe.cr (https://github.com/confact/stripe.cr) - Stripe api wrapper
⟡ tmdb.cr (https://github.com/mmacia/tmdb.cr) - The Movie DB (TMDb) api wrapper
⟡ twitter-crystal (https://github.com/sferik/twitter-crystal) - A library to access the Twitter API
⟡ web_finger (https://github.com/toddsundsted/web_finger) - A WebFinger (https://tools.ietf.org/html/rfc7033) client
⟡ ynab.cr (https://github.com/jaredsmithse/ynab.cr) - A library to interact with your YNAB data
Validation
⟡ accord (https://github.com/neovintage/accord) - Shareable validation library for Crystal Objects
⟡ Athena Validator (https://github.com/athena-framework/validator) - Robust & flexible validation framework
⟡ validations (https://github.com/vladfaust/validations.cr) - Validations mixin
⟡ validator (https://github.com/Nicolab/crystal-validator) - Data check and validation
Web Frameworks
⟡ amber (https://github.com/amberframework/amber) - Open source efficient and cohesive web application framework
⟡ Athena (https://github.com/athena-framework/athena) - A web framework comprised of reusable, independent components
⟡ grip (https://github.com/grip-framework/grip) - The microframework for writing powerful web applications
⟡ kemal (https://github.com/kemalcr/kemal) - Lightning Fast, Super Simple web framework. Inspired by Sinatra
⟡ lucky (https://github.com/luckyframework/lucky) - Catch bugs early, forget about most performance issues, and spend more time on code instead of debugging and writing tests
⟡ marten (https://github.com/martenframework/marten) - A web framework that makes building web applications easy, productive, and fun
⟡ runcobo (https://github.com/runcobo/runcobo) - An api framework with simple, intuitive and consistent DSL, using jbuilder to render json
⟡ Shivneri (https://github.com/ujjwalguptaofficial/shivneri) - Component based MVC web framework for crystal targeting good code structures, modularity & performance
⟡ spider-gazelle (https://github.com/spider-gazelle/spider-gazelle) - A Rails esque web framework with a focus on speed and extensibility
Community
⟡ Crystal Forum (https://forum.crystal-lang.org/)
⟡ Crystal newsletter (https://crystal-lang.org/#newsletter)
⟡ Gitter (https://gitter.im/crystal-lang/crystal)
⟡ IRC (ircs://irc.libera.chat:6697#crystal-lang) - #crystal-lang on Libera
⟡ Reddit (https://www.reddit.com/r/crystal_programming/)
⟡ Stackoverflow (https://stackoverflow.com/tags/crystal-lang/info)
Unofficial
⟡ Chinese-speaking Telegram Group (https://t.me/crystal_cn) - 来吧！TG 中文圈的朋友们！
⟡ Crystal Programming Discord Server (https://discord.gg/YS7YvQy) - Unofficial Discord server dedicated to the Crystal Programming Language
⟡ Portuguese-speaking Telegram Group (https://t.me/crystalbrasil) - Bem vindos ao Crystal Brasil!
⟡ Russian-speaking Telegram Group (https://t.me/crystal_ru) - Добро пожаловать, товарищ!
Resources
⟡ Crystal for Rubyists (http://www.crystalforrubyists.com/) - Free book to bootstrap your Crystal journey
⟡ Crystal Shards for Ruby Gems (https://github.com/crystal-lang/crystal/wiki/Crystal-Shards-for-Ruby-Gems) - A list of Ruby Gems and their Crystal Shards equivalents
⟡ crystal-koans (https://github.com/ilmanzo/crystal-koans) - Learn Crystal by writing unit tests
⟡ crystal-lang.org (https://crystal-lang.org) - Official language site
⟡ devdocs.io (https://devdocs.io/crystal/) - API Documentation Browser with Crystal support
⟡ Programming Crystal (https://pragprog.com/book/crystal/programming-crystal) - PragProg book to start your Crystal journey
Official Documentation Translations
⟡ br.crystal-lang.org (http://br.crystal-lang.org/) - Brazilian
⟡ ja.crystal-lang.org (http://ja.crystal-lang.org/) - Japanese
⟡ kr.crystal-lang.org (https://kr.crystal-lang.org/) - Korean
⟡ ru.crystal-lang.org (http://ru.crystal-lang.org/) - Russian
⟡ tw.crystal-lang.org (http://tw.crystal-lang.org/) - Chinese Traditional
Services and Apps
⟡ carc.in (https://carc.in/) - A web service that runs your code and displays the result
⟡ Crank (https://github.com/arktisklada/crank) - A Procfile-based application manager (like Foreman)
⟡ cry (https://github.com/elorest/cry) - Ability to execute crystal code in a fashion similar to Ruby's pry edit
⟡ Crystal ANN (https://crystal-ann.com) - Announce new project, blog post, version update or any other Crystal work
⟡ DeBot (https://github.com/jhass/DeBot) - IRC bot written in Crystal
⟡ icr (https://github.com/crystal-community/icr) - Interactive console for Crystal (like IRB for Ruby)
⟡ Invidious (https://github.com/iv-org/invidious) - Invidious is an alternative front-end to YouTube
⟡ mpngin (https://github.com/thewalkingtoast/mpngin) - A URL shortener with simple stats
⟡ procodile (https://github.com/crystal-china/procodile_cr) - Run processes in the background (and foreground) on Mac & Linux from a Procfile (for production and/or development environments)
⟡ quicktype (https://quicktype.io/) - Generate models and serializers from JSON, JSON Schema, GraphQL, and TypeScript
⟡ shards.info (http://shards.info/) - Web service that lists all repositories on GitHub that have Crystal code in them. The sources are available on GitHub
(https://github.com/mamantoha/shards-info)
Tools
⟡ ast_helper (https://github.com/bcardiff/crystal-ast-helper) - Helper tool to debug parser and formatter
⟡ crystal-base (https://github.com/ruivieira/crystal-base) - CentOS base docker image for Crystal development
⟡ crystal-dash-docset (https://github.com/Sija/crystal-dash-docset) - Dash (https://kapeli.com/dash) docset generator
⟡ port_ruby_to_crystal (https://github.com/crystal-china/port_ruby_to_crystal) - A regex replace ruby script for port ruby code to crystal easier, reduce friction
⟡ public_suffix (https://github.com/toddsundsted/public_suffix) - A small library designed to make the Public Suffix List (https://publicsuffix.org/) easier to use
DevOps
⟡ ansible-crystal (https://github.com/CorbanR/ansible-crystal) - Ansible playbook for installing crystal
⟡ DPPM (https://github.com/DFabric/dppm) - An easy, universal way to install and manage applications as packages (mostly Linux)
Editor Plugins
⟡ Acme:
⟡ acmecrystal (https://github.com/ilanpillemer/acmecrystal) - Reformats crystal code in acme
⟡ Atom
⟡ crystal-tools (https://atom.io/packages/crystal-tools) - Enables built in tools in Crystal compiler
⟡ language-crystal-actual (https://atom.io/packages/language-crystal-actual) - Crystal language support in Atom
⟡ Emacs
⟡ crystal-mode (https://melpa.org/#/crystal-mode) - Crystal language support for Emacs (crystal-lang-tools/emacs-crystal-mode (https://github.com/crystal-lang-tools/emacs-crystal-mode))
⟡ Geany
⟡ geany-crystal (https://github.com/crystal-lang-tools/geany-crystal) - Crystal support for the Geany editor (https://www.geany.org/)
⟡ IntelliJ IDEA
⟡ intellij-crystal-lang (https://github.com/asedunov/intellij-crystal-lang) - Crystal support for the JetBrains IDEs
⟡ Lite-XL
⟡ lite-plugin-crystal (https://github.com/Tamnac/lite-plugin-crystal) - Crystal support for the Lite-XL (https://lite-xl.com/en/) editor
⟡ Spacemacs
⟡ crystal-spacemacs-layer (https://github.com/juanedi/crystal-spacemacs-layer) - Spacemacs contribution layer for Crystal
⟡ Sublime
⟡ sublime-crystal (https://github.com/crystal-lang-tools/sublime-crystal) - Crystal syntax highlighting for sublime Text
⟡ TextMate
⟡ Crystal.tmbundle (https://github.com/crystal-lang-tools/Crystal.tmbundle) - Crystal syntax highlighting, compile, format command, snippets
⟡ Vim
⟡ vim-crystal (https://github.com/vim-crystal/vim-crystal) - Vim filetype support for Crystal
⟡ vim-slang (https://github.com/elorest/vim-slang) - Vim filetype support for Slang Templating Engine
⟡ Visual Studio Code
⟡ vscode-crystal-lang (https://github.com/crystal-lang-tools/vscode-crystal-lang) - Formatter, linter and syntax highlighting for cr and ecr files
LSP Language Server Protocol Implementations
⟡ crystalline (https://github.com/elbywan/crystalline) - Crystalline is an implementation of the Language Server Protocol written in and for the Crystal Language
⟡ scry (https://github.com/crystal-lang-tools/scry) - Code analysis server for Crystal implementing the Language Server Protocol (https://microsoft.github.io/language-server-protocol/)
Shell plugins
⟡ crun (https://github.com/Val/crun) - Crystal Run : shebang wrapper for Crystal
⟡ crystal-zsh (https://github.com/veelenga/crystal-zsh) - .oh-my-zsh plugin
Awesome Crystal
!Awesome (https://awesome.re/badge.svg) (https://awesome.re)
A curated list of awesome Crystal code and resources. Inspired by awesome (https://github.com/sindresorhus/awesome) and awesome-awesomeness (https://github.com/bayandin/awesome-awesomeness).
The goal is to have projects mostly stable and useful for the community.
Search shards at shards.info (https://shards.info) or follow announcements Crystal ANN (https://crystal-ann.com) for more.
Contributions are welcome. Please take a quick look at the contribution guidelines (https://github.com/veelenga/awesome-crystal/blob/master/.github/CONTRIBUTING.md) first.
⟡ Awesome Crystal (#awesome-crystal)
⟡ Algorithms and Data structures (#algorithms-and-data-structures)
⟡ Blockchain (#blockchain)
⟡ C Bindings (#c-bindings)
⟡ Caching (#caching)
⟡ CLI Builders (#cli-builders)
⟡ CLI Utils (#cli-utils)
⟡ Code Analysis and Metrics (#code-analysis-and-metrics)
⟡ Compression (#compression)
⟡ Configuration (#configuration)
⟡ Converters (#converters)
⟡ Cryptography (#cryptography)
⟡ Data Formats (#data-formats)
⟡ Data Generators (#data-generators)
⟡ Database Drivers/Clients (#database-driversclients)
⟡ Database Tools (#database-tools)
⟡ Debugging (#debugging)
⟡ Dependency Injection (#dependency-injection)
⟡ Email (#email)
⟡ Environment Management (#environment-management)
⟡ Examples and funny stuff (#examples-and-funny-stuff)
⟡ Framework Components (#framework-components)
⟡ Game Development (#game-development)
⟡ GUI Development (#gui-development)
⟡ HTML Builders (#html-builders)
⟡ HTML/XML parsing (#htmlxml-parsing)
⟡ HTTP (#http)
⟡ Image Processing (#image-processing)
⟡ Implementations/Compilers (#implementationscompilers)
⟡ Internationalization (#internationalization)
⟡ Logging and monitoring (#logging-and-monitoring)
⟡ Machine Learning (#machine-learning)
⟡ Markdown/Text Processors (#markdowntext-processors)
⟡ Misc (#misc)
⟡ Network Protocols (#network-protocols)
⟡ Networking (#networking)
⟡ ORM/ODM Extensions (#ormodm-extensions)
⟡ Package Management (#package-management)
⟡ Processes and Threads (#processes-and-threads)
⟡ Project Generators (#project-generators)
⟡ Queues and Messaging (#queues-and-messaging)
⟡ Routing (#routing)
⟡ Scheduling (#scheduling)
⟡ Science and Data analysis (#science-and-data-analysis)
⟡ Search (#search)
⟡ Serverless Computing (#serverless-computing)
⟡ System (#system)
⟡ Task management (#task-management)
⟡ Template Engine (#template-engine)
⟡ Testing (#testing)
⟡ Third-party APIs (#third-party-apis)
⟡ Validation (#validation)
⟡ Web Frameworks (#web-frameworks)
⟡ Community (#community)
⟡ Unofficial (#unofficial)
⟡ Resources (#resources)
⟡ Official Documentation Translations (#official-documentation-translations)
⟡ Services and Apps (#services-and-apps)
⟡ Tools (#tools)
⟡ DevOps (#devops)
⟡ Editor Plugins (#editor-plugins)
⟡ LSP Language Server Protocol Implementations (#lsp-language-server-protocol-implementations)
⟡ Shell Plugins (#shell-plugins)
Algorithms and Data structures
⟡ bisect (https://github.com/spider-gazelle/bisect) - Inserting values into a sorted array
⟡ blurhash.cr (https://github.com/Sija/blurhash.cr) - BlurHash (https://github.com/woltapp/blurhash) implementation
⟡ crie (https://github.com/c910335/crie) - Compile-time Trie
⟡ CrOTP (https://github.com/philnash/crotp) - HOTP and TOTP implementation for two factor authentication
⟡ crystal-linked-list (https://github.com/abvdasker/crystal-linked-list) - Implementation of Linked List
⟡ crystaledge (https://github.com/unn4m3d/crystaledge) - A pure Vector Math library
⟡ crystalg (https://github.com/tobyapi/crystalg) - A Generic Algorithm Library
⟡ crystalline (https://github.com/jtomschroeder/crystalline) - A collection of containers and algorithms
⟡ csuuid (https://github.com/wyhaines/csuuid.cr) - A Chronologically Sortable UUID
⟡ edits.cr (https://github.com/tcrouch/edits.cr) - Collection of edit distance algorithms
⟡ fzy (https://github.com/hugopl/fzy) - A Crystal port of awesome Fzy project fuzzy finder algorithm
⟡ Goban (https://github.com/soya-daizu/goban) - A fast and efficient QR Code implementation
⟡ graphlb (https://github.com/mettuaditya/graphlb) - Collection of graph datastructure and algorithms
⟡ haversine (https://github.com/geocrystal/haversine) - An Implementation of the Haversine formula
⟡ HKDF (https://github.com/spider-gazelle/HKDF) - HMAC-based Extract-and-Expand Key Derivation Function rfc5869 (https://www.rfc-editor.org/rfc/rfc5869)
⟡ kd_tree (https://github.com/geocrystal/kd_tree) - An implementation of "K-Dimensional Tree" and "N-Nearest Neighbors"
⟡ ksuid.cr (https://github.com/Sija/ksuid.cr) - K-Sortable Globally Unique IDs
⟡ markov (https://github.com/mccallofthewild/markov) - Build Markov Chains and run Markov Processes
⟡ multiset.cr (https://github.com/tcrouch/multiset.cr) - Implementation of a multiset
⟡ named_information (https://github.com/spider-gazelle/named_information) - Naming Things with Hashes rfc6920 (https://datatracker.ietf.org/doc/html/rfc6920)
⟡ qr-code (https://github.com/spider-gazelle/qr-code) - QR Code generator
⟡ radix (https://github.com/luislavena/radix) - Radix Tree implementation
⟡ s2_cells (https://github.com/spider-gazelle/s2_cells) - S2 Geometry (https://s2geometry.io/devguide/s2cell_hierarchy.html) for spatial indexing
⟡ secure-remote-password (https://github.com/spider-gazelle/secure-remote-password) - SRP-6a protocol for authentication over an insecure network
⟡ SPAKE2+ (https://github.com/spider-gazelle/SPAKE2_plus) - Password Authenticated Key Exchange (PAKE) protocol, comparable to SRP-6a
⟡ splay_tree_map (https://github.com/wyhaines/splay_tree_map.cr) - Splay Tree implementation that conforms to the Hash ducktype
⟡ verhoeff (https://github.com/spider-gazelle/verhoeff) - Implementation of the Verhoeff checksum algorithm
Blockchain
⟡ Axentro (https://github.com/Axentro/Axentro) - A custom blockchain platform
⟡ Cocol (https://github.com/cocol-project/cocol) - A minimal blockchain testbed
⟡ secp256k1.cr (https://github.com/q9f/secp256k1.cr) - Elliptic curve used in the public-private-key cryptography
C bindings
⟡ augeas.cr (https://github.com/fernandes/augeas.cr) - Bindings for Augeas (https://augeas.net/)
⟡ clang.cr (https://github.com/crystal-lang/clang.cr) - Libclang bindings
⟡ crt.cr (https://github.com/maiha/crt.cr) - Bindings for libncursesw and crt
⟡ crystal-gsl (https://github.com/konovod/crystal-gsl) - Bindings for GNU Scientific Library (https://www.gnu.org/software/gsl/)
⟡ crystal-hunspell (https://github.com/mamantoha/crystal-hunspell) - Bindings for Hunspell (https://hunspell.github.io/)
⟡ duktape.cr (https://github.com/jessedoyle/duktape.cr) - Bindings for the Duktape (https://github.com/svaarala/duktape) javascript engine
⟡ fftw.cr (https://github.com/firejox/fftw.cr) - Bindings for FFTW (https://fftw.org/) library
⟡ gphoto2.cr (https://github.com/Sija/gphoto2.cr) - Bindings for the libgphoto2 (http://www.gphoto.org/) library
⟡ icu.cr (https://github.com/olbat/icu.cr) - Bindings for the ICU (http://site.icu-project.org/) library
⟡ libnotify.cr (https://github.com/splattael/libnotify.cr) - Bindings for Libnotify
⟡ nlopt.cr (https://github.com/konovod/nlopt.cr) - Bindings for NLOpt (https://nlopt.readthedocs.io/en/latest/)
⟡ pcap.cr (https://github.com/maiha/pcap.cr) - Bindings for libpcap
⟡ pledge.cr (https://github.com/chris-huxtable/pledge.cr) - Bindings for OpenBSD's pledge(2)
⟡ ssh2.cr (https://github.com/spider-gazelle/ssh2.cr) - Bindings for libssh2 library
⟡ syslog.cr (https://github.com/chris-huxtable/syslog.cr) - Bindings for syslog
⟡ v4l2.cr (https://github.com/spider-gazelle/v4l2.cr) - Bindings for Video4Linux2 (https://en.wikipedia.org/wiki/Video4Linux)
⟡ wasmer-crystal (https://github.com/naqvis/wasmer-crystal) - Bindings for the wasmer WebAssembly runtime
⟡ win32cr (https://github.com/mjblack/win32cr) - Bindings for Win32 API
⟡ x_do.cr (https://github.com/woodruffw/x_do.cr) - Bindings for libxdo (xdotool (https://github.com/jordansissel/xdotool))
Caching
⟡ crystal-memcached (https://github.com/comandeo/crystal-memcached) - Implementation of a memcached client
CLI Builders
⟡ admiral (https://github.com/jwaldrip/admiral.cr) - A robust DSL for writing command line interfaces
⟡ Athena Console (https://github.com/athena-framework/console) - Allows for the creation of CLI based commands
⟡ clicr (https://github.com/j8r/clicr) - A simple declarative command line interface builder
⟡ clim (https://github.com/at-grandpa/clim) - Slim command line interface builder
⟡ Cling (https://github.com/devnote-dev/cling) - A modular, non-macro-based command line interface library
⟡ commander (https://github.com/mrrooijen/commander) - Command-line interface builder
⟡ Keimeno (https://github.com/robacarp/keimeno) - A lightweight text user interface library in Crystal
⟡ OptionParser (https://crystal-lang.org/api/OptionParser.html) - command-line options processing (Crystal stdlib)
⟡ Phreak (https://github.com/shinzlet/phreak) - A highly flexible Crystal CLI builder in the style of OptionParser
CLI Utils
⟡ climate (https://github.com/Sija/climate.cr) - Tiny tool to make your CLI output 🌈 coloured
⟡ coin (https://github.com/caian-org/coin) - Command-line application that performs currency conversion via the Fixer API (https://fixer.io)
⟡ cride (https://github.com/j8r/cride) - A light CLI text editor/IDE
⟡ git-repository (https://github.com/place-labs/git-repository) - A git cli wrapper querying and cloning remote repositories with minimal data transfer
⟡ hetzner-k3s (https://github.com/vitobotta/hetzner-k3s) - A CLI tool to quickly create and manage Kubernetes clusters in Hetzner Cloud
⟡ lff (https://github.com/mkdika/lff-cr) - Simple and straightforward large files finder utility in command line
⟡ meet (https://github.com/ryanprior/meet) - Start a jitsi meeting quickly from the comfort of your command line
⟡ oq (https://github.com/Blacksmoke16/oq) - A performant, and portable jq wrapper to facilitate the consumption and output of formats other than JSON; using jq
(https://github.com/stedolan/jq) filters to transform the data
⟡ progress_bar.cr (https://github.com/TPei/progress_bar.cr) - A simple and customizable progress bar
⟡ tablo (https://github.com/hutou/tablo) - A flexible terminal table generator
⟡ tallboy (https://github.com/epoch/tallboy) - Generate ASCII character tables with support for spanning cells over multiple columns
Code Analysis and Metrics
⟡ ameba (https://github.com/crystal-ameba/ameba) - A static code analysis tool
⟡ linguist.cr (https://github.com/microgit-com/linguist.cr) - Using multiple ways to find programming language used in files, based on Github's Linguist
Compression
⟡ Crystar (https://github.com/naqvis/crystar) - Readers and writers of Tar archive format
⟡ Gzip (https://crystal-lang.org/api/Compress/Gzip.html) - readers and writers of gzip format (Crystal stdlib)
⟡ polylines.cr (https://github.com/BuonOmo/polylines.cr) — compression of series of coordinates
⟡ snappy (https://github.com/naqvis/snappy) - Snappy compression format reader/writer for Crystal
⟡ Zip (https://crystal-lang.org/api/Compress/Zip.html) - readers and writers of zip format (Crystal stdlib)
⟡ Zlib (https://crystal-lang.org/api/Compress/Zlib.html) - readers and writers of zlib format (Crystal stdlib)
⟡ zstd.cr (https://github.com/didactic-drunk/zstd.cr) - Bindings for Zstandard (https://github.com/facebook/zstd) compression library
Configuration
⟡ cr-dotenv (https://github.com/gdotdesign/cr-dotenv) - Loads .env file
⟡ Envy (https://github.com/grottopress/envy) - Load environment variables from YAML
⟡ envyable (https://github.com/philnash/envyable.cr) - A simple YAML to ENV config loader
⟡ habitat (https://github.com/luckyframework/habitat) - Type safe configuration for your classes and modules
⟡ totem (https://github.com/icyleaf/totem) - Load and parse a configuration in JSON, YAML, dotenv formats
Converters
⟡ base62.cr (https://github.com/Sija/base62.cr) - Base62 encoder/decoder, well suited for url-shortening
⟡ crunits (https://github.com/spider-gazelle/crunits) - Tool for converting units of measure (miles to kilometers, celsius to fahrenheit etc)
⟡ money (https://github.com/crystal-money/money) - Handling money and currency conversion with ease (almost complete port of RubyMoney (https://github.com/RubyMoney/money))
⟡ sass.cr (https://github.com/straight-shoota/sass.cr) - Compile SASS/SCSS to CSS (libsass (https://github.com/sass/libsass/) binding)
Cryptography
⟡ cmac (https://github.com/spider-gazelle/cmac) - Crystal implementation of Cipher-based Message Authentication Code (CMAC)
⟡ ed25519 (https://github.com/spider-gazelle/ed25519) - the Ed25519 elliptic curve public-key signature system
described in RFC 8032
⟡ monocypher.cr (https://github.com/konovod/monocypher.cr) - Crystal wrapper for the Monocypher crypto library
⟡ sodium.cr (https://github.com/didactic-drunk/sodium.cr) - Crystal wrapper for the libsodium crypto API
Data Formats
⟡ BinData (https://github.com/spider-gazelle/bindata) - Binary data parser helper with an ASN.1 (https://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One) parser
⟡ config.cr (https://github.com/chris-huxtable/config.cr) - Easy to use configuration format parser
⟡ crinder (https://github.com/c910335/crinder) - Class based json renderer
⟡ Crystalizer (https://github.com/j8r/crystalizer) - (De)serialize any Crystal object; supporting JSON, YAML, and Byte formats out of the box
⟡ CSV (https://crystal-lang.org/api/CSV.html) - parsing and generating for comma-separated values (Crystal stdlib)
⟡ front_matter.cr (https://github.com/chris-huxtable/front_matter.cr) - Separates a files front matter from its content
⟡ geoip2.cr (https://github.com/delef/geoip2.cr) - GeoIP2 reader
⟡ HAR (https://github.com/NeuraLegion/har) - HAR (HTTP Archive) parser
⟡ INI (https://crystal-lang.org/api/INI.html) - INI file parser (Crystal stdlib)
⟡ JSON (https://crystal-lang.org/api/JSON.html) - parsing and generating JSON documents (Crystal stdlib)
⟡ json-schema (https://github.com/spider-gazelle/json-schema) - convert JSON serializable classes into a JSON Schema (https://json-schema.org/) representation
⟡ JSON::OnSteroids (https://github.com/anykeyh/json_on_steroids) - handle and mutate JSON document easily
⟡ maxminddb.cr (https://github.com/delef/maxminddb.cr) - MaxMindDB reader
⟡ toml.cr (https://github.com/crystal-community/toml.cr) - TOML parser
⟡ XML (https://crystal-lang.org/api/XML.html) - parsing and generating XML documents (Crystal stdlib)
⟡ YAML (https://crystal-lang.org/api/YAML.html) - parsing and generating YAML documents (Crystal stdlib)
Data Generators
⟡ faker (https://github.com/askn/faker) - A library for generating fake data
⟡ hashids.cr (https://github.com/splattael/hashids.cr) - A library to generate YouTube-like ids from one or many numbers
⟡ prime (https://github.com/wontruefree/prime) - A prime number generator
Database Drivers/Clients
⟡ couchdb.cr (https://github.com/TechMagister/couchdb.cr) - CouchDB client
⟡ cryomongo (https://github.com/elbywan/cryomongo) - MongoDB driver
⟡ crystal-db (https://github.com/crystal-lang/crystal-db) - Common db api
⟡ crystal-ldap (https://github.com/spider-gazelle/crystal-ldap) - LDAP client
⟡ crystal-mysql (https://github.com/crystal-lang/crystal-mysql) - MySQL connector for Crystal
⟡ crystal-pg (https://github.com/will/crystal-pg) - A Postgres driver
⟡ crystal-redis (https://github.com/stefanwille/crystal-redis) - Full featured Redis client
⟡ crystal-rethinkdb (https://github.com/kingsleyh/crystal-rethinkdb) - Driver for RethinkDB / RebirthDB
⟡ crystal-sqlite3 (https://github.com/crystal-lang/crystal-sqlite3) - SQLite3 bindings
⟡ leveldb (https://github.com/crystal-community/leveldb) - Crystal bindings for LevelDB
⟡ rocksdb.cr (https://github.com/maiha/rocksdb.cr) - RocksDB client
⟡ surrealdb.cr (https://github.com/yorci/surrealdb.cr) - Unoffical SurrealDB HTTP & Websocket Client
Database Tools
⟡ migrate (https://github.com/vladfaust/migrate.cr) - A simpler database migration tool with transactions
Debugging
⟡ backtracer.cr (https://github.com/Sija/backtracer.cr) - Shard aiming to assist with parsing backtraces into a structured form
⟡ debug.cr (https://github.com/Sija/debug.cr) - debug!(…) macro for pp-style debugging
Dependency Injection
⟡ Athena Dependency Injection (https://github.com/athena-framework/dependency-injection) - Robust dependency injection service container framework
⟡ Crystal-DI (https://github.com/funk-yourself/crystal-di) - Lightweight DI Container
⟡ HardWire (https://github.com/jerometwell/hardwire) - A compile-time non-intrusive dependency injection system
⟡ syringe (https://github.com/Bonemind/syringe) - A simple and basic dependency injection shard for crystal
⟡ carbon (https://github.com/luckyframework/carbon) - Fun, testable, and adapter-based email library
⟡ crystal-email (https://github.com/arcage/crystal-email) - Simple e-mail sending library
⟡ CrystalEmail (https://git.sceptique.eu/Sceptique/CrystalEmail) - A RFC compliant Email validator
⟡ sendgrid.cr (https://github.com/dlanileonardo/sendgrid.cr) - Simple Sendgrid Client
Environment Management
⟡ asdf-crystal (https://github.com/marciogm/asdf-crystal) - Plugin for asdf version manager
⟡ crenv (https://github.com/crenv/crenv) - Crystal version manager
⟡ rcm.cr (https://github.com/maiha/rcm.cr) - Redis Cluster Manager
Examples and funny stuff
⟡ blackjack-cr (https://github.com/gdonald/blackjack-cr) - Console Blackjack
⟡ crystal-patterns (https://github.com/crystal-community/crystal-patterns) - Examples of GOF patters
⟡ crystalworld (https://github.com/vladfaust/crystalworld) - realworld.io (https://realworld.io) back-end API implementation
⟡ exercism-crystal (https://github.com/exercism/crystal) - Exercism exercises
⟡ try.cr (https://github.com/maiha/try.cr) - Try monad
Framework Components
⟡ Athena Event Dispatcher (https://github.com/athena-framework/event-dispatcher) - A Mediator and Observer pattern event library
⟡ Athena Negotiation (https://github.com/athena-framework/negotiation) - Framework agnostic content negotiation library
⟡ device_detector (https://github.com/creadone/device_detector) - Shard for detect device by user agent string
⟡ Exception Page (https://github.com/crystal-loot/exception_page) - An exceptional exception page for Crystal web libraries and frameworks
⟡ graphql (https://github.com/graphql-crystal/graphql) - Type-safe GraphQL (http://graphql.org) server implementation
⟡ graphql-crystal (https://github.com/ziprandom/graphql-crystal) - GraphQL (http://graphql.org) implementation
⟡ kemal-session (https://github.com/kemalcr/kemal-session) - Session handler for Kemal
⟡ mochi (https://github.com/awcrotwell/mochi) - Authentication shard inspired by Devise supporting: Authenticable, Confirmable, Invitable & more
⟡ motion.cr (https://github.com/awcrotwell/motion.cr) - Object oriented frontend library for Amber
⟡ multi-auth (https://github.com/msa7/multi_auth) - Standardized multi-provider OAuth2 authentication (inspired by omniauth)
⟡ praetorian (https://github.com/ilanusse/praetorian) - Minimalist authorization library inspired by Pundit
⟡ Shield (https://github.com/grottopress/shield) - Comprehensive security for Lucky framework
⟡ shrine.cr (https://github.com/jetrockets/shrine.cr) - File Attachment toolkit for Crystal applications. Heavily inspired by Shrine for Ruby
⟡ tourmaline (https://github.com/protoncr/tourmaline) - Telegram bot framework with an API loosely based on telegraf.js (https://telegraf.js.org/)
Game Development
⟡ CrSFML (https://github.com/oprypin/crsfml) - Bindings to SFML (https://www.sfml-dev.org/) multimedia/game library
⟡ crystal-chipmunk (https://github.com/oprypin/crystal-chipmunk) - Bindings to Chipmunk (http://chipmunk-physics.net/), a fast and lightweight 2D game physics library
⟡ crystal-imgui-sfml (https://github.com/oprypin/crystal-imgui-sfml) - Bindings to integrate Dear ImGui (https://github.com/ocornut/imgui) into an SFML (https://www.sfml-dev.org/) project
⟡ entitas.cr (https://github.com/spoved/entitas.cr) - A Entity Component System Framework for Crystal
⟡ MyECS (https://github.com/konovod/myecs) - A Sparse Entity Component System Framework for Crystal
⟡ Raylib-cr (https://github.com/sol-vin/raylib-cr) - Direct bindings to Raylib (https://raylib.com), which supports Linux, Windows, and Mac
⟡ SDL-Crystal-Bindings (https://github.com/Hadeweka/SDL-Crystal-Bindings) - Direct (unsafe) bindings to SDL2 (https://www.libsdl.org/), intended for writing own game libraries
GUI Development
⟡ crystal-imgui (https://github.com/oprypin/crystal-imgui) - Bindings to Dear ImGui (https://github.com/ocornut/imgui), an immediate-mode graphical UI library
⟡ GTK4.cr (https://github.com/hugopl/gtk4.cr) - Bindings for GTK4 (https://docs.gtk.org/gtk4/overview.html) with Crystalized API
⟡ Iu (https://github.com/grkek/iu) - UI framework based on the Fusion/libui.cr (https://github.com/Fusion/libui.cr) library, with custom elements and modified bindings from
hedron-crystal/hedron (https://github.com/hedron-crystal/hedron)
⟡ Ultimate GTK4 Crystal Guide (https://ultimate-gtk4-crystal-guide.geopjr.dev/) - Learn how to create premium GTK4 apps in Crystal
HTML Builders
⟡ blueprint (https://github.com/gunbolt/blueprint) - Write reusable and testable HTML templates in plain Crystal
⟡ form_builder.cr (https://github.com/westonganger/form_builder.cr) - Dead simple HTML form builder for Crystal with built-in support for many popular UI libraries such as Bootstrap
⟡ to_html (https://github.com/sbsoftware/to_html.cr) - The fastest HTML builder engine for Crystal
⟡ Water (https://github.com/shootingfly/water) - A library for writing HTML in plain Crystal
HTML/XML Parsing
⟡ docx_cr_converter (https://github.com/aristotelesbr/docx_cr_converter) - parse DOCX Word
⟡ myhtml (https://github.com/kostya/myhtml) - Fast HTML5 Parser that includes CSS selectors
HTTP
⟡ Cable (https://github.com/cable-cr/cable) - An ActionCable "port" to Crystal, framework agnostic, 100% compatible with the ActionCable JS Client
⟡ cossack (https://github.com/crystal-community/cossack) - Simple flexible HTTP client
⟡ crest (https://github.com/mamantoha/crest) - Simple HTTP and REST client, inspired by the Ruby's RestClient gem
⟡ crul (https://github.com/porras/crul) - Command line HTTP client
⟡ digest-auth (https://github.com/spider-gazelle/digest-auth) - Digest authentication
⟡ halite (https://github.com/icyleaf/halite) - Crystal HTTP Requests with a chainable REST API, built-in sessions and loggers
⟡ http-multiserver.cr (https://github.com/vladfaust/http-multiserver.cr) - Mounting multiple servers via routes (a.k.a. URL mapping)
⟡ http-params-serializable (https://github.com/vladfaust/http-params-serializable) - HTTP params (de)serialization, applicable to URL queries and URL-encoded forms
⟡ http-protection (https://github.com/rogeriozambon/http-protection) - Protection against typical web attacks
⟡ http2 (https://github.com/ysbaddaden/http2) - HTTP/2 Protocol Implementation
⟡ HTTP::Client (https://crystal-lang.org/api/HTTP/Client.html) - HTTP client (Crystal stdlib)
⟡ HTTP::Server (https://crystal-lang.org/api/HTTP/Server.html) - HTTP server (Crystal stdlib)
⟡ HTTP::WebSocket (https://crystal-lang.org/api/HTTP/WebSocket.html) - HTTP WebSocket client (Crystal stdlib)
⟡ link-header (https://github.com/spider-gazelle/link-header) - HTTP Link Header Parser
⟡ ntlm (https://github.com/spider-gazelle/ntlm) - NTLM authentication
⟡ proxy-fetcher.cr (https://github.com/nbulaj/proxy-fetcher.cr) - Proxy lists fetching & validating library
⟡ sse.cr (https://github.com/y2k2mt/sse.cr) - Server-Sent Events (https://html.spec.whatwg.org/multipage/server-sent-events.html) client
Image processing
⟡ celestine (https://github.com/celestinecr/celestine) - Create SVG images using a DSL
⟡ ffmpeg (https://github.com/spider-gazelle/ffmpeg) - FFmpeg bindings that works with StumpyPNG to extract frames
⟡ Pluto (https://github.com/phenopolis/pluto) - A fast and convenient image processing library
⟡ stumpy_png (https://github.com/stumpycr/stumpy_png) - Read and write PNG images
Implementations/Compilers
⟡ charly (https://github.com/charly-lang) - Charly Programming Language
⟡ cltk (https://github.com/ziprandom/cltk) - A crystal port of the Ruby Language Toolkit
⟡ crisp (https://github.com/rhysd/Crisp) - Lisp dialect implemented with Crystal
⟡ LinCAS-lang (https://github.com/LinCAS-lang) - A programming language for scientific computation
⟡ mint-lang (https://github.com/mint-lang/mint) - A refreshing programming language for the front-end web
⟡ myst-lang (https://github.com/myst-lang/) - A practical, dynamic language designed to be written and understood as easily and efficiently as possible
⟡ novika (https://github.com/novika-lang/novika) - A free-form, moldable, interpreted programming language
⟡ runic-lang (https://github.com/runic-lang) - In-design toy language
Internationalization
⟡ crystal-i18n (https://github.com/crystal-i18n/i18n) - An internationalization library inspired by Ruby-I18n
⟡ i18n.cr (https://github.com/vladfaust/i18n.cr) - Internationalization shard
⟡ Lens (https://github.com/syeopite/lens) - A multiformat internationalization (i18n) shard for Crystal. Supports Gettext, Ruby YAML, etc.
⟡ Rosetta (https://github.com/wout/rosetta) - A blazing fast internationalization (i18n) library with compile-time key lookup supporting YAML and JSON formats
Logging and monitoring
⟡ crafana (https://github.com/spoved/crafana.cr) - A Grafana (https://grafana.com/) library to help autogenerate dashboards
⟡ fiber_metrics.cr (https://github.com/didactic-drunk/fiber_metrics.cr) - Track run time, wait time, or memory allocations per Fiber, method or block
⟡ Log (https://crystal-lang.org/api/Log.html) - logging utility (Crystal stdlib)
⟡ statsd.cr (https://github.com/miketheman/statsd.cr) - Statsd (https://github.com/etsy/statsd) client library
Machine Learning
⟡ ai4cr (https://github.com/drhuffman12/ai4cr) - Artificial Intelligence (based on https://github.com/SergioFierens/ai4r)
⟡ Cadmium (https://github.com/cadmiumcr/cadmium) - NLP library based heavily on natural (https://github.com/NaturalNode/natural)
⟡ crystal-fann (https://github.com/NeuraLegion/crystal-fann) - FANN (Fast Artifical Neural Network) binding
⟡ mxnet.cr (https://github.com/toddsundsted/mxnet.cr) - Bindings for MXNet (https://mxnet.incubator.apache.org/)
⟡ shainet (https://github.com/NeuraLegion/shainet) - SHAInet (Neural Network in pure crystal)
Markdown/Text Processors
⟡ cr-cmark-gfm (https://github.com/amauryt/cr-cmark-gfm) - Crystal C bindings for cmark-gfm to work with Commonmark and Github Flavored Markdown
⟡ markd (https://github.com/icyleaf/markd) - Yet another markdown parser built for speed, Compliant to CommonMark specification
Misc
⟡ aasm.cr (https://github.com/veelenga/aasm.cr) - Easy to use finite state machine for Crystal classes
⟡ any_hash.cr (https://github.com/Sija/any_hash.cr) - Recursive Hash with better JSON::Any included
⟡ anyolite (https://github.com/Anyolite/anyolite) - Full mruby interpreter with simple bindings, allowing for easy scripting support in projects
⟡ burocracia.cr (https://github.com/vinibrsl/burocracia.cr) - burocracia.cr the dependecyless shard to validate, generate and format Brazilian burocracias such as CPF, CNPJ and CEP
⟡ callbacks (https://github.com/vladfaust/callbacks.cr) - Expressive callbacks module
⟡ circuit_breaker (https://github.com/TPei/circuit_breaker) - Implementation of the circuit breaker pattern
⟡ CrSignals (https://github.com/firejox/CrSignals) - Signals/slots notification library
⟡ crystal-binary_parser (https://github.com/DanSnow/crystal-binary_parser) - Binary parser
⟡ crystal-web-framework-stars (https://github.com/isaced/crystal-web-framework-stars) - Web frameworks for Crystal, most starred on Github
⟡ crz (https://github.com/dhruvrajvanshi/crz) - Functional programming library
⟡ defined (https://github.com/wyhaines/defined.cr) - macros for conditional compilation based on constant definitions, version requirements, or environment variable settings
⟡ emoji.cr (https://github.com/veelenga/emoji.cr) - Emoji library
⟡ gphoto2-web.cr (https://github.com/Sija/gphoto2-web.cr) - Web API for libgphoto2
⟡ immutable (https://github.com/lucaong/immutable) - Implementation of thread-safe, persistent, immutable collections
⟡ iterm2 (https://github.com/toddsundsted/iterm2) - Display images within the terminal using the ITerm2 Inline Images Protocol
⟡ monads (https://github.com/alex-lairan/monads) - Monad implementation
⟡ observable (https://github.com/TPei/observable) - Implementation of the observer pattern
⟡ pinger (https://github.com/spider-gazelle/pinger) - Ping IP addresses and DNS entries without requiring sudo
⟡ port_midi (https://github.com/jimm/crystal_port_midi) - Crystal C bindings for the PortMIDI cross-platform MIDI I/O library
⟡ retriable.cr (https://github.com/Sija/retriable.cr) - Simple DSL to retry failed code blocks
⟡ serf-handler.cr (https://github.com/wyhaines/serf-handler.cr) - Framework for building Serf handlers, with a suite of useful builtin capabilities
⟡ simple_retry (https://github.com/spider-gazelle/simple_retry) - Simple tool for retrying failed code blocks
⟡ sslscan.cr (https://github.com/NeuraLegion/sslscan.cr) - Crystal shard wrapping the rbsec/sslscan utility
⟡ version_tools (https://github.com/anicholson/crystal-version-tools) - Version-dependent behaviour, specified at compile-time
⟡ wafalyzer (https://github.com/NeuraLegion/wafalyzer) - Web Application Firewall (WAF) Detector - shard + cli
⟡ zaru_crystal (https://github.com/szTheory/zaru_crystal) - Filename sanitization
Network Protocols
⟡ amqp-client.cr (https://github.com/cloudamqp/amqp-client.cr) - AMQP 0-9.1, a messaging protocol, implemented by eg. RabbitMQ
⟡ connect-proxy (https://github.com/spider-gazelle/connect-proxy) - Connect method style of HTTP tunnelling / HTTP proxy
⟡ cr-xmpp (https://github.com/naqvis/cr-xmpp) - XMPP/Jabber Library
⟡ Crirc (https://github.com/Meoowww/Crirc) - IRC protocol implementation (Client, Server, Bots)
⟡ crystal-bacnet (https://github.com/spider-gazelle/crystal-bacnet) - BACnet protocol implementation with BACnet/IP client
⟡ crystal-dns (https://gitlab.com/jgillich/crystal-dns) - DNS protocol implementation and resolver
⟡ crystal-json-socket (https://github.com/foi/crystal-json-socket) - JSON-socket client & server implementation. Inspired by and compatible with node-json-socket
(https://github.com/sebastianseilund/node-json-socket/) and ruby-json-socket (https://github.com/foi/ruby-json-socket)
⟡ crystal-mqtt (https://github.com/spider-gazelle/crystal-mqtt) - A MQTT client
⟡ crystal-snmp (https://github.com/spider-gazelle/crystal-snmp) - An SNMP implementation with version 1, 2c and 3 support
⟡ fast_irc.cr (https://github.com/RX14/fast_irc.cr) - Fast IRC parser/generator
⟡ jwt (https://github.com/crystal-community/jwt) - Implementation of JWT (JSON Web Token)
⟡ mDNS (https://github.com/spider-gazelle/mdns) - DNS Service Discovery and multicast DNS
⟡ mqtt-client.cr (https://github.com/84codes/mqtt-client.cr) - A fast and lightweight MQTT client
⟡ msgpack-crystal (https://github.com/crystal-community/msgpack-crystal) - MessagePack library
⟡ OAuth (https://crystal-lang.org/api/OAuth.html) - OAuth consumer (Crystal stdlib)
⟡ OAuth2 (https://crystal-lang.org/api/OAuth2.html) - OAuth2 client (Crystal stdlib)
⟡ OpenSSL (https://crystal-lang.org/api/OpenSSL.html) - bindings to libssl (Crystal stdlib)
⟡ simple_rpc (https://github.com/kostya/simple_rpc) - RPC Server and Client for Crystal. Implements msgpack-rpc protocol
⟡ stomp (https://github.com/spider-gazelle/stomp) - STOMP protocol
⟡ telnet.cr (https://github.com/spider-gazelle/telnet.cr) - Telnet protocol
⟡ transfer_more (https://git.sceptique.eu/Sceptique/transfer_more) - Clone of transfer.sh to uploads files
Networking
⟡ ipaddress.cr (https://github.com/Sija/ipaddress.cr) - Library to handle IPv4 and IPv6 addresses
⟡ mac-address (https://github.com/automatico/mac-address) - Library for working with MAC addresses
ORM/ODM Extensions
⟡ avram (https://github.com/luckyframework/avram) - A database wrapper for reading, writing, and migrating Postgres databases
⟡ clear (https://github.com/anykeyh/clear) - ORM specialized to PostgreSQL only but with advanced features
⟡ crecto (https://github.com/Crecto/crecto) - Database wrapper, based on Ecto
⟡ granite (https://github.com/amberframework/granite) - ORM for Postgres, Mysql, Sqlite
⟡ jennifer.cr (https://github.com/imdrasil/jennifer.cr) - Active Record pattern implementation with flexible query chainable builder and migration system
⟡ rethinkdb-orm (https://github.com/spider-gazelle/rethinkdb-orm) - ORM for RethinkDB / RebirthDB
Package Management
⟡ shards (https://github.com/crystal-lang/shards) - Dependency manager for the Crystal
Processes and Threads
⟡ await_async (https://github.com/anykeyh/await_async) - Add keywords await & async in Crystal Lang
⟡ concurrent.cr (https://github.com/didactic-drunk/concurrent.cr) - Simplified concurrency using streams/pipelines, waitgroups, semaphores, smores and more
⟡ neph (https://github.com/tbrand/neph) - A modern command line job processor that can execute jobs concurrently
⟡ promise (https://github.com/spider-gazelle/promise) - A Promise implementation with type inference
⟡ werk (https://github.com/marghidanu/werk) - Dead simple task runner with concurrent support, ideal for local CI
Project Generators
⟡ crystal_lib (https://github.com/crystal-lang/crystal_lib) - Automatic binding generator for native libraries
⟡ fez (https://github.com/jwoertink/fez) - A Kemal application generator
⟡ libgen (https://github.com/olbat/libgen) - Automatic bindings generator configured using JSON/YAML files
Queues and Messaging
⟡ crafka (https://github.com/BT-OpenSource/crafka) - Apache Kafka library utilizing librdkafka
⟡ mosquito (https://github.com/mosquito-cr/mosquito/) - Redis backed periodic and ad hoc job processing
⟡ NATS.io (https://github.com/nats-io/nats.cr) - NATS client
⟡ sidekiq.cr (https://github.com/mperham/sidekiq.cr) - Simple, efficient job processing
Routing
⟡ orion (https://github.com/obsidian/orion) - A minimal, rails-esque routing library
⟡ router.cr (https://github.com/tbrand/router.cr) - Minimum but powerful http router for HTTP::Server
Scheduling
⟡ crystime (https://gitlab.com/crystallabs/crystime) - Advanced time, calendar, schedule, and remind library
⟡ schedule.cr (https://github.com/hugoabonizio/schedule.cr) - Run periodic tasks
⟡ tasker (https://github.com/spider-gazelle/tasker) - A high precision scheduler including timezone aware cron jobs
Science and Data analysis
⟡ alea (https://github.com/nin93/alea) - Repeatable sampling, CDF and other utilities to work with probability distributions
⟡ ishi (https://github.com/toddsundsted/ishi) - Graph plotting package with a small API and sensible defaults powered by gnuplot
⟡ linalg (https://github.com/konovod/linalg) - Linear algebra library inspired by MATLAB and SciPy.linalg
⟡ num.cr (https://github.com/crystal-data/num.cr) - Numerical computing library supporting N-Dimensional data
⟡ predict.cr (https://github.com/RX14/predict.cr) - Satellite prediction library using the sgp4 model
⟡ quartz (https://github.com/RomainFranceschini/quartz) - Modeling and simulation framework
Search
⟡ hermes (https://github.com/imdrasil/hermes.cr) - Data Mapper pattern implementation for ElastiSearch
Serverless Computing
⟡ crystal_openfaas (https://github.com/TPei/crystal_openfaas/) - Template to enable crystal as first class citizens in OpenFaaS
⟡ secrets-env (https://github.com/spider-gazelle/secrets-env) - Extends ENV module to read values injected by docker / kubernetes secrets and other orchestration tools
System
⟡ baked_file_system (https://github.com/schovi/baked_file_system) - Virtual file system implementation
⟡ hardware (https://github.com/crystal-community/hardware) - Get CPU, Memory and Network informations of the running OS and its processes
Task management
⟡ cake (https://github.com/axvm/cake) - Production-ready Make-like utility tool
⟡ sam (https://github.com/imdrasil/sam.cr) - Another one Rake-like task manager with namespacing and arguments system
Template Engine
⟡ crinja (https://github.com/straight-shoota/crinja) - An implementation of the Jinja2 template engine (http://jinja.pocoo.org/)
⟡ crustache (https://github.com/MakeNowJust/crustache) - {{Mustache}} (https://mustache.github.io) for Crystal
⟡ ECR (Embedded Crystal) (https://crystal-lang.org/api/ECR.html) - compile time template language which uses plain crystal expressions (Crystal stdlib)
⟡ Jbuilder (https://github.com/shootingfly/jbuilder) - Generate JSON objects with a Builder-style DSL, inspired by jbuilder
⟡ Kilt (https://github.com/jeromegn/kilt) - Abstraction layer for template engines
⟡ Slang (https://github.com/jeromegn/slang) - Lightweight, terse, templating language inspired by Ruby's Slim
⟡ teeplate (https://github.com/mosop/teeplate) - A library for rendering multiple template files
Testing
⟡ Athena Spec (https://github.com/athena-framework/spec) - Common/helpful Spec (https://crystal-lang.org/api/Spec.html) compliant testing utilities
⟡ crotest (https://github.com/emancu/crotest) - A tiny and simple test framework
⟡ crytic (https://github.com/hanneskaeufler/crytic) - Mutation testing framework
⟡ hashr (https://github.com/crystal-china/hashr) - A tiny class makes test on JSON response easier
⟡ LuckyFlow (https://github.com/luckyframework/lucky_flow) - Automated browser tests similar to Capybara
⟡ mass-spec (https://github.com/c910335/mass-spec) - Web API testing library
⟡ microtest (https://github.com/Ragmaanir/microtest) - Small opinionated testing library focusing on power asserts
⟡ minitest.cr (https://github.com/ysbaddaden/minitest.cr) - Library for unit tests and assertions
⟡ mocks.cr (https://github.com/waterlink/mocks.cr) - Mocking library for Crystal
⟡ Spec (https://crystal-lang.org/api/Spec.html) - spec framework (Crystal stdlib)
⟡ spectator (https://gitlab.com/arctic-fox/spectator) - Feature rich spec framework that uses the modern expect syntax
⟡ timecop.cr (https://github.com/crystal-community/timecop.cr) - Library for mocking with Time.now. Inspired by the timecop ruby gem (https://github.com/travisjeffery/timecop)
⟡ vcr (https://github.com/spoved/vcr.cr) - A HTTP capture and replay implementation for crystal
⟡ webdriver_pump (https://github.com/bwilczek/webdriver_pump) - Page Object library. Inspired by Ruby's WatirPump (https://github.com/bwilczek/watir_pump)
⟡ webmock.cr (https://github.com/manastech/webmock.cr) - Library for stubbing HTTP::Client requests
Third-party APIs
⟡ amazonite (https://github.com/rjnienaber/amazonite) - An unofficial SDK supporting popular AWS APIs
⟡ aws-signer.cr (https://github.com/beanieboi/aws-signer.cr) - This library signs your HTTP requests using AWS v4
⟡ awscr-s3 (https://github.com/taylorfinnell/awscr-s3) - AWS S3 interface
⟡ awscr-signer (https://github.com/taylorfinnell/awscr-signer) - Sign HTTP::Request objects and generate presigned post forms
⟡ crystal-consul (https://github.com/rogerwelin/crystal-consul) - Consul API client
⟡ crystal-darksky (https://github.com/sb89/crystal-darksky) - Wrapper for the Dark Sky (https://darksky.net) API
⟡ crystal-swapi (https://github.com/sb89/crystal-swapi) - Star Wars API (SWAPI) wrapper
⟡ crystal_slack (https://github.com/manastech/crystal_slack) - A tool that parses Slack slash commands or send incoming web hooks
⟡ GDAX (https://github.com/mccallofthewild/gdax) - GDAX REST and WebSocket API Wrapper with request signing
⟡ gitlab.cr (https://github.com/icyleaf/gitlab.cr) - GitLab API wrapper
⟡ google (https://github.com/PlaceOS/google) - Google API wrapper
⟡ host_meta (https://github.com/toddsundsted/host_meta) - A Web Host Metadata (https://tools.ietf.org/html/rfc6415) client
⟡ kube-client.cr (https://github.com/spoved/kube-client.cr) - Kubernetes API Client
⟡ mixpanel-crystal (https://github.com/petoem/mixpanel-crystal) - A library for sending events to Mixpanel
⟡ mollie.cr (https://github.com/wout/mollie.cr) - Mollie (https://www.mollie.com/en/) Payments API wrapper (Creditcard, PayPal, Apple Pay, Sofort, Klarna, ...)
⟡ office365 (https://github.com/PlaceOS/office365) - Microsoft Graph API wrapper
⟡ pinboard.cr (https://github.com/oz/pinboard.cr) - Pinboard (https://pinboard.in) API
⟡ raven.cr (https://github.com/sija/raven.cr) - Raven is a client for Sentry (https://github.com/getsentry/sentry)
⟡ stripe.cr (https://github.com/confact/stripe.cr) - Stripe api wrapper
⟡ tmdb.cr (https://github.com/mmacia/tmdb.cr) - The Movie DB (TMDb) api wrapper
⟡ twitter-crystal (https://github.com/sferik/twitter-crystal) - A library to access the Twitter API
⟡ web_finger (https://github.com/toddsundsted/web_finger) - A WebFinger (https://tools.ietf.org/html/rfc7033) client
⟡ ynab.cr (https://github.com/jaredsmithse/ynab.cr) - A library to interact with your YNAB data
Validation
⟡ accord (https://github.com/neovintage/accord) - Shareable validation library for Crystal Objects
⟡ Athena Validator (https://github.com/athena-framework/validator) - Robust & flexible validation framework
⟡ validations (https://github.com/vladfaust/validations.cr) - Validations mixin
⟡ validator (https://github.com/Nicolab/crystal-validator) - Data check and validation
Web Frameworks
⟡ amber (https://github.com/amberframework/amber) - Open source efficient and cohesive web application framework
⟡ Athena (https://github.com/athena-framework/athena) - A web framework comprised of reusable, independent components
⟡ grip (https://github.com/grip-framework/grip) - The microframework for writing powerful web applications
⟡ kemal (https://github.com/kemalcr/kemal) - Lightning Fast, Super Simple web framework. Inspired by Sinatra
⟡ lucky (https://github.com/luckyframework/lucky) - Catch bugs early, forget about most performance issues, and spend more time on code instead of debugging and writing tests
⟡ marten (https://github.com/martenframework/marten) - A web framework that makes building web applications easy, productive, and fun
⟡ runcobo (https://github.com/runcobo/runcobo) - An api framework with simple, intuitive and consistent DSL, using jbuilder to render json
⟡ Shivneri (https://github.com/ujjwalguptaofficial/shivneri) - Component based MVC web framework for crystal targeting good code structures, modularity & performance
⟡ spider-gazelle (https://github.com/spider-gazelle/spider-gazelle) - A Rails esque web framework with a focus on speed and extensibility
Community
⟡ Crystal Forum (https://forum.crystal-lang.org/)
⟡ Crystal newsletter (https://crystal-lang.org/#newsletter)
⟡ Gitter (https://gitter.im/crystal-lang/crystal)
⟡ IRC (ircs://irc.libera.chat:6697#crystal-lang) - #crystal-lang on Libera
⟡ Reddit (https://www.reddit.com/r/crystal_programming/)
⟡ Stackoverflow (https://stackoverflow.com/tags/crystal-lang/info)
Unofficial
⟡ Chinese-speaking Telegram Group (https://t.me/crystal_cn) - 来吧！TG 中文圈的朋友们！
⟡ Crystal Programming Discord Server (https://discord.gg/YS7YvQy) - Unofficial Discord server dedicated to the Crystal Programming Language
⟡ Portuguese-speaking Telegram Group (https://t.me/crystalbrasil) - Bem vindos ao Crystal Brasil!
⟡ Russian-speaking Telegram Group (https://t.me/crystal_ru) - Добро пожаловать, товарищ!
Resources
⟡ Crystal for Rubyists (http://www.crystalforrubyists.com/) - Free book to bootstrap your Crystal journey
⟡ Crystal Shards for Ruby Gems (https://github.com/crystal-lang/crystal/wiki/Crystal-Shards-for-Ruby-Gems) - A list of Ruby Gems and their Crystal Shards equivalents
⟡ crystal-koans (https://github.com/ilmanzo/crystal-koans) - Learn Crystal by writing unit tests
⟡ crystal-lang.org (https://crystal-lang.org) - Official language site
⟡ devdocs.io (https://devdocs.io/crystal/) - API Documentation Browser with Crystal support
⟡ Programming Crystal (https://pragprog.com/book/crystal/programming-crystal) - PragProg book to start your Crystal journey
Official Documentation Translations
⟡ br.crystal-lang.org (http://br.crystal-lang.org/) - Brazilian
⟡ ja.crystal-lang.org (http://ja.crystal-lang.org/) - Japanese
⟡ kr.crystal-lang.org (https://kr.crystal-lang.org/) - Korean
⟡ ru.crystal-lang.org (http://ru.crystal-lang.org/) - Russian
⟡ tw.crystal-lang.org (http://tw.crystal-lang.org/) - Chinese Traditional
Services and Apps
⟡ carc.in (https://carc.in/) - A web service that runs your code and displays the result
⟡ Crank (https://github.com/arktisklada/crank) - A Procfile-based application manager (like Foreman)
⟡ cry (https://github.com/elorest/cry) - Ability to execute crystal code in a fashion similar to Ruby's pry edit
⟡ Crystal ANN (https://crystal-ann.com) - Announce new project, blog post, version update or any other Crystal work
⟡ DeBot (https://github.com/jhass/DeBot) - IRC bot written in Crystal
⟡ icr (https://github.com/crystal-community/icr) - Interactive console for Crystal (like IRB for Ruby)
⟡ Invidious (https://github.com/iv-org/invidious) - Invidious is an alternative front-end to YouTube
⟡ mpngin (https://github.com/thewalkingtoast/mpngin) - A URL shortener with simple stats
⟡ procodile (https://github.com/crystal-china/procodile_cr) - Run processes in the background (and foreground) on Mac & Linux from a Procfile (for production and/or development environments)
⟡ quicktype (https://quicktype.io/) - Generate models and serializers from JSON, JSON Schema, GraphQL, and TypeScript
⟡ shards.info (http://shards.info/) - Web service that lists all repositories on GitHub that have Crystal code in them. The sources are available on GitHub
(https://github.com/mamantoha/shards-info)
Tools
⟡ ast_helper (https://github.com/bcardiff/crystal-ast-helper) - Helper tool to debug parser and formatter
⟡ crystal-base (https://github.com/ruivieira/crystal-base) - CentOS base docker image for Crystal development
⟡ crystal-dash-docset (https://github.com/Sija/crystal-dash-docset) - Dash (https://kapeli.com/dash) docset generator
⟡ port_ruby_to_crystal (https://github.com/crystal-china/port_ruby_to_crystal) - A regex replace ruby script for port ruby code to crystal easier, reduce friction
⟡ public_suffix (https://github.com/toddsundsted/public_suffix) - A small library designed to make the Public Suffix List (https://publicsuffix.org/) easier to use
DevOps
⟡ ansible-crystal (https://github.com/CorbanR/ansible-crystal) - Ansible playbook for installing crystal
⟡ DPPM (https://github.com/DFabric/dppm) - An easy, universal way to install and manage applications as packages (mostly Linux)
Editor Plugins
⟡ Acme:
⟡ acmecrystal (https://github.com/ilanpillemer/acmecrystal) - Reformats crystal code in acme
⟡ Atom
⟡ crystal-tools (https://atom.io/packages/crystal-tools) - Enables built in tools in Crystal compiler
⟡ language-crystal-actual (https://atom.io/packages/language-crystal-actual) - Crystal language support in Atom
⟡ Emacs
⟡ crystal-mode (https://melpa.org/#/crystal-mode) - Crystal language support for Emacs (crystal-lang-tools/emacs-crystal-mode (https://github.com/crystal-lang-tools/emacs-crystal-mode))
⟡ Geany
⟡ geany-crystal (https://github.com/crystal-lang-tools/geany-crystal) - Crystal support for the Geany editor (https://www.geany.org/)
⟡ IntelliJ IDEA
⟡ intellij-crystal-lang (https://github.com/asedunov/intellij-crystal-lang) - Crystal support for the JetBrains IDEs
⟡ Lite-XL
⟡ lite-plugin-crystal (https://github.com/Tamnac/lite-plugin-crystal) - Crystal support for the Lite-XL (https://lite-xl.com/en/) editor
⟡ Spacemacs
⟡ crystal-spacemacs-layer (https://github.com/juanedi/crystal-spacemacs-layer) - Spacemacs contribution layer for Crystal
⟡ Sublime
⟡ sublime-crystal (https://github.com/crystal-lang-tools/sublime-crystal) - Crystal syntax highlighting for sublime Text
⟡ TextMate
⟡ Crystal.tmbundle (https://github.com/crystal-lang-tools/Crystal.tmbundle) - Crystal syntax highlighting, compile, format command, snippets
⟡ Vim
⟡ vim-crystal (https://github.com/vim-crystal/vim-crystal) - Vim filetype support for Crystal
⟡ vim-slang (https://github.com/elorest/vim-slang) - Vim filetype support for Slang Templating Engine
⟡ Visual Studio Code
⟡ vscode-crystal-lang (https://github.com/crystal-lang-tools/vscode-crystal-lang) - Formatter, linter and syntax highlighting for cr and ecr files
LSP Language Server Protocol Implementations
⟡ crystalline (https://github.com/elbywan/crystalline) - Crystalline is an implementation of the Language Server Protocol written in and for the Crystal Language
⟡ scry (https://github.com/crystal-lang-tools/scry) - Code analysis server for Crystal implementing the Language Server Protocol (https://microsoft.github.io/language-server-protocol/)
Shell plugins
⟡ crun (https://github.com/Val/crun) - Crystal Run : shebang wrapper for Crystal
⟡ crystal-zsh (https://github.com/veelenga/crystal-zsh) - .oh-my-zsh plugin