Awesome FOSS apps !Awesome (https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg) (https://github.com/sindresorhus/awesome)

▐ A curated list of awesome production grade free and open source software organized by category.

This list is for developers who are looking for non-trivial quality applications they can analyze and learn from.

Inspired by Sindre Sorhus's awesome (https://github.com/sindresorhus/awesome).

TOC

- Webapps (frontend only) (#web-apps-frontend-only)
- Webapps (fullstack) (#web-apps-fullstack)
- Desktop Apps (#desktop-apps)
- Mobile Apps (#mobile-apps)
- Games (#games)


Web Apps (frontend only)
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Codesandbox (https://github.com/CompuIves/codesandbox-client)

⟡ react, nginx, phoenix
⟡ GNU General Public License

▐ Codesandbox is an online IDE for web developers to quickly prototype and implement frontend applications using modern javascript frameworks like Vue, Preact, React etc Or even vanilla javascript.  

CircleCI (https://github.com/circleci/frontend)

⟡ clojurescript, om, react
⟡ Eclipse Public License

▐ CircleCI provides a continuous integration and deployment platform. The frontend is an impressive example of a large application built with the immutable data structures of clojurescript. The frontend 
▐ integrates with pusher, intercom, d3, and google analytics and has a great example of navigation routing and communication via real-time events, websockets, and backend API servers. Its test suite is not that 
▐ extensive but does provide a good example of how to test clojurescript/om apps using karma.

Precursor App (https://github.com/PrecursorApp/precursor)

⟡ clojurescript, om, react
⟡ Eclipse Public License

▐ Precursor is a highly interactive prototyping webapp. Its frontend is built from the ground up with clojurescript. The project has a simple enough routing and event passing system such that newer clojurescript
▐ developers could easily understand how routing in clojurescript applications can work. It is also full of many examples of how to build a component based frontend architecture that is part of an interactive 
▐ graphics application i.e. where many components manipulate the HTML5 canvas or work with HTML5 APIs. 

The Guardian (https://github.com/guardian/frontend)

⟡ play2, scala, node
⟡ Apache 2.0 License

▐ The guardian is a news site with subscriptions, sign in, search, an admin interface and a series of middleman scala apps that handle communication between the static frontends and backend APIs. Its very fast 
▐ and has a comprehensive test suite plus great examples of how to optimize large traditional websites for speed.

Web Apps (fullstack)
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Ghost (https://github.com/TryGhost/Ghost)

⟡ node, express, ember
⟡ MIT License

▐ Ghost provides a simple publishing platform for bloggers. The code contains an emberjs client and node server backend that handle authorization, role management, tagging, blog posting, data persistence, and 
▐ most things you'd expect from a quality blogging platform. The only thing that Ghost doesn't handle is i18n. It also contains a comprehensive test suite with both integration and unit tests that hit the whole 
▐ ember/node stack.

Gitlab (https://github.com/gitlabhq/gitlabhq)

⟡ ruby, rails, coffescript, redis, sidekiq,
⟡ MIT License

▐ Gitlab is a code collaboration tool. It is used by more than 100,000 organizations. It has just about everything you could imagine in a webapp, user management, user roles, OAuth, i18n, many modules designed 
▐ for integrating with third-parties, deep git integration, and an extensive asynchronous task system using Sidekiq. It has an exemplary test suite using cucumber and rspec.

Discourse (https://github.com/discourse/discourse)

⟡ ruby, rails, ember
⟡ GPLv2 License

▐ Discourse is a discussion platform or a modern take on the web forum. It has a very modular system built on top of rails and contains great examples of how to build an interactive frontend in ember within a 
▐ rails application. It has an admin interface, signup/sign-in with Oauth for Google, Facebook, Twitter, Yahoo, and Github. It has extensive i18n, real time notifications, a plugin ecosystem, is SEO optimized, 
▐ and is designed for tablet and mobile devices.

Reddit (https://github.com/reddit)

⟡ python, pylons, node, react, rabbitmq, postgresql
⟡ Common Public Attribution License Version 1.0

▐ Reddit is a news platform for what's new and popular on the web. It is built in python and integrates with a lot of third party services: rabbitmq, memcached, cassandra, solr, and postgresql to name a few. The
▐ code provides a good example of a large pylons project and shines when it comes to the code that integrates with many other services.

Taiga (https://github.com/taigaio)

⟡ python3, django, coffeescript, angular
⟡ GNU Affero License

▐ Taiga is a project management tool. It is an incredible example of a modular architecture. Its interface is clean, very well-designed, responsive, and fast, and the modern backend code written in python3 is a 
▐ great example of a well written django app. It also has an extensive test suite with both integration and unit tests using pytest.


Travis CI (https://github.com/travis-ci)

⟡ ruby, rails, sinatra, rabbitmq, ember
⟡ MIT License

▐ Travis CI is a continutous integration and deployment system. What's great about Travis is its modular architecture, every component of this large distributed system is split up by its main function. From 
▐ worker management, rails backend, emberjs frontend to yaml configuration parser, each is split up into there own repositories.

Filestash (https://github.com/mickael-kerjean/filestash)

⟡ golang, react
⟡ AGPLv3 License

▐ Filestash is a web based file manager that supports a range of protocols and platforms: FTP, SFTP, S3, Minio, Git, WebDAV, Backblaze, Dropbox, Google Drive, LDAP, CalDAV, CardDAV.

Dnote (https://github.com/dnote/dnote)

⟡ golang, react, typescript
⟡ GPLv3 License, AGPLv3 License

▐ Dnote is a free and open source command line note-taking software that supports a scalable data synchronization among an unlimited number of devices and a mobile-first web interface that can also be installed 
▐ as a Progressive Web App on mobile devices.

Healthchecks (https://github.com/healthchecks/healthchecks)

⟡ python, django, postgresql
⟡ BSD License

▐ Healthchecks is a cron job monitoring service. It listens for HTTP requests and email messages ("pings") from your cron jobs and scheduled tasks ("checks"). When a ping does not arrive on time, Healthchecks 
▐ sends out alerts.

Desktop Apps
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Blender (http://www.blender.org/download/)

⟡ c, c++, python
⟡ GPLv2 License

▐ Blender is 3D Graphic Software that can visually compete with Maya and 3DS Max. The end product is an amazing example of a cross-platform 3D Tooling piece of software. It is a very mature project having been 
▐ in development since 1994. It has an embedded python scripting engine, a game logic engine and is loaded with implementations of 3d manipulation, rendering, and compositing algorithms.


Atom (https://github.com/atom/atom)

⟡ coffeescript, electron, node
⟡ MIT License

▐ Atom is a hackable text editor. Its built on top of electron and is a good example of integrating libchromium, nodejs, and web technologies into a cross-platform runnable binary. It also contains an exemplary 
▐ test suite for electron apps.

Mobile Apps
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still searching

Games
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0ad (https://github.com/0ad/0ad)

⟡ c++, python
⟡ GPLv2 License

▐ 0 A.D is a cross-platform real-time strategy game of ancient warfare. Every aspect of the game's implementation is modern and impressive - from the AI to the graphics. It also has an embedded SpiderMonkey 
▐ scripting engine, which is a great example for adding js scriptability to an existing cpp project.

Hedgewars (https://github.com/hedgewars/hw)

⟡ c, c++, pascal, haskell
⟡ GPLv2 License

▐ Hedgewars is a 2D turn-based strategy game like worms but with hedgehogs. Its graphics, animation, and gameplay can compete with worms on every level. The game server is an impressive real-world example of 
▐ Haskell and the frontend provides a clean interface between QT and the backend game.

Wesnoth (https://github.com/wesnoth/wesnoth)

⟡ c, c++, lua
⟡ GPLv2 License

▐ The Battle for Wesnoth is a turn-based tactical strategy game with a high fantasy theme. It features single player and online multiplayer combat. Its GUI and gameplay graphics are impressive as well as its 
▐ multi-platform support (it even builds on NaCL). It has clean, well-coded examples of pretty much everything a game developer would want to know, from a an embedded lua scripting engine, to a dialog and GUI 
▐ system, to a c++ test suite and cross-platform builds.


License

!CC0 (http://i.creativecommons.org/p/zero/1.0/88x31.png) (http://creativecommons.org/publicdomain/zero/1.0/)

To the extent possible under law, John Faucett has waived all copyright and related or neighboring rights to this work.