Awesome CTF !Build Status (https://travis-ci.org/apsdehal/awesome-ctf.svg?branch=master) (https://travis-ci.org/apsdehal/awesome-ctf) !Awesome (https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg) 
                                                                                                      (https://github.com/sindresorhus/awesome)

A curated list of Capture The Flag (https://en.wikipedia.org/wiki/Capture_the_flag#Computer_security) (CTF) frameworks, libraries, resources, softwares and tutorials. This list aims to help starters as well as seasoned CTF players to find 
everything related to CTFs at one place.

Contributing

Please take a quick look at the contribution guidelines (https://github.com/apsdehal/ctf-tools/blob/master/CONTRIBUTING.md) first.

_If you know a tool that isn't present here, feel free to open a pull request._

Why?

It takes time to build up collection of tools used in CTF and remember them all. This repo helps to keep all these scattered tools at one place.

Contents

- Awesome CTF (#awesome-ctf)
  - Create (#create)
- **Forensics** (#forensics)        
- **Platforms** (#platforms)        
- **Steganography** (#steganography)
- **Web** (#web)                    
  - Solve (#solve)
- **Attacks** (#attacks)              
- **Bruteforcers** (#bruteforcers)    
- **Cryptography** (#crypto)          
- **Exploits** (#exploits)            
- **Forensics** (#forensics-1)        
- **Networking** (#networking)        
- **Reversing** (#reversing)          
- **Services** (#services)            
- **Steganography** (#steganography-1)
- **Web** (#web-1)                    

- Resources (#resources)
  - Operating Systems (#operating-systems)
  - Starter Packs (#starter-packs)
  - Tutorials (#tutorials)
  - Wargames (#wargames)
  - Websites (#websites)
  - Wikis (#wikis)
  - Writeups Collections (#writeups-collections)


                                                                                                                        Create

Tools used for creating CTF challenges

- Kali Linux CTF Blueprints (https://www.packtpub.com/eu/networking-and-servers/kali-linux-ctf-blueprints) - Online book on building, testing, and customizing your own Capture the Flag challenges.


Forensics

Tools used for creating Forensics challenges

- Dnscat2 (https://github.com/iagox86/dnscat2) - Hosts communication through DNS.
- Kroll Artifact Parser and Extractor (KAPE) (https://learn.duffandphelps.com/kape) - Triage program.
- Magnet AXIOM (https://www.magnetforensics.com/downloadaxiom) - Artifact-centric DFIR tool.
- Registry Dumper (http://www.kahusecurity.com/posts/registry_dumper_find_and_dump_hidden_registry_keys.html) - Dump your registry.

Platforms

Projects that can be used to host a CTF

- CTFd (https://github.com/isislab/CTFd) - Platform to host jeopardy style CTFs from ISISLab, NYU Tandon.
- echoCTF.RED (https://github.com/echoCTF/echoCTF.RED) - Develop, deploy and maintain your own CTF infrastructure.
- FBCTF (https://github.com/facebook/fbctf) - Platform to host Capture the Flag competitions from Facebook.
- Haaukins (https://github.com/aau-network-security/haaukins)- A Highly Accessible and Automated Virtualization Platform for Security Education.
- HackTheArch (https://github.com/mcpa-stlouis/hack-the-arch) - CTF scoring platform.
- Mellivora (https://github.com/Nakiami/mellivora) - A CTF engine written in PHP.
- MotherFucking-CTF (https://github.com/andreafioraldi/motherfucking-ctf) - Badass lightweight plaform to host CTFs. No JS involved.
- NightShade (https://github.com/UnrealAkama/NightShade) - A simple security CTF framework.
- OpenCTF (https://github.com/easyctf/openctf) - CTF in a box. Minimal setup required.
- PicoCTF (https://github.com/picoCTF/picoCTF) - The platform used to run picoCTF. A great framework to host any CTF.
- PyChallFactory (https://github.com/pdautry/py_chall_factory) - Small framework to create/manage/package jeopardy CTF challenges.
- RootTheBox (https://github.com/moloch--/RootTheBox) - A Game of Hackers (CTF Scoreboard & Game Manager).
- Scorebot (https://github.com/legitbs/scorebot) - Platform for CTFs by Legitbs (Defcon).
- SecGen (https://github.com/cliffe/SecGen) - Security Scenario Generator. Creates randomly vulnerable virtual machines.

Steganography

Tools used to create stego challenges

Check solve section for steganography.

Web

Tools used for creating Web challenges

JavaScript Obfustcators

- Metasploit JavaScript Obfuscator (https://github.com/rapid7/metasploit-framework/wiki/How-to-obfuscate-JavaScript-in-Metasploit)
- Uglify (https://github.com/mishoo/UglifyJS)


                                                                                                                        Solve

Tools used for solving CTF challenges

Attacks

Tools used for performing various kinds of attacks

- Bettercap (https://github.com/bettercap/bettercap) - Framework to perform MITM (Man in the Middle) attacks.
- Yersinia (https://github.com/tomac/yersinia) - Attack various protocols on layer 2.

Crypto

Tools used for solving Crypto challenges

- CyberChef (https://gchq.github.io/CyberChef) - Web app for analysing and decoding data.
- FeatherDuster (https://github.com/nccgroup/featherduster) - An automated, modular cryptanalysis tool.
- Hash Extender (https://github.com/iagox86/hash_extender) - A utility tool for performing hash length extension attacks.
- padding-oracle-attacker (https://github.com/KishanBagaria/padding-oracle-attacker) - A CLI tool to execute padding oracle attacks.
- PkCrack (https://www.unix-ag.uni-kl.de/~conrad/krypto/pkcrack.html) - A tool for Breaking PkZip-encryption.
- QuipQuip (https://quipqiup.com) - An online tool for breaking substitution ciphers or vigenere ciphers (without key).
- RSACTFTool (https://github.com/Ganapati/RsaCtfTool) - A tool for recovering RSA private key with various attack.
- RSATool (https://github.com/ius/rsatool) - Generate private key with knowledge of p and q.
- XORTool (https://github.com/hellman/xortool) - A tool to analyze multi-byte xor cipher.

Bruteforcers

Tools used for various kind of bruteforcing (passwords etc.)

- Hashcat (https://hashcat.net/hashcat/) - Password Cracker
- Hydra (https://tools.kali.org/password-attacks/hydra) - A parallelized login cracker which supports numerous protocols to attack
- John The Jumbo (https://github.com/magnumripper/JohnTheRipper) - Community enhanced version of John the Ripper.
- John The Ripper (http://www.openwall.com/john/) - Password Cracker.
- Nozzlr (https://github.com/intrd/nozzlr) - Nozzlr is a bruteforce framework, trully modular and script-friendly.
- Ophcrack (http://ophcrack.sourceforge.net/) - Windows password cracker based on rainbow tables.
- Patator (https://github.com/lanjelot/patator) - Patator is a multi-purpose brute-forcer, with a modular design.
- Turbo Intruder (https://portswigger.net/research/turbo-intruder-embracing-the-billion-request-attack) - Burp Suite extension for sending large numbers of HTTP requests 

Exploits

Tools used for solving Exploits challenges

- DLLInjector (https://github.com/OpenSecurityResearch/dllinjector) - Inject dlls in processes.
- libformatstr (https://github.com/hellman/libformatstr) - Simplify format string exploitation.
- Metasploit (http://www.metasploit.com/) - Penetration testing software.
  - Cheatsheet (https://www.comparitech.com/net-admin/metasploit-cheat-sheet/)
- one_gadget (https://github.com/david942j/one_gadget) -  A tool to find the one gadget execve('/bin/sh', NULL, NULL) call.
  - gem install one_gadget
- Pwntools (https://github.com/Gallopsled/pwntools) - CTF Framework for writing exploits.
- Qira (https://github.com/BinaryAnalysisPlatform/qira) - QEMU Interactive Runtime Analyser.
- ROP Gadget (https://github.com/JonathanSalwan/ROPgadget) - Framework for ROP exploitation.
- V0lt (https://github.com/P1kachu/v0lt) - Security CTF Toolkit.

Forensics

Tools used for solving Forensics challenges

- Aircrack-Ng (http://www.aircrack-ng.org/) - Crack 802.11 WEP and WPA-PSK keys.
  - apt-get install aircrack-ng
- Audacity (http://sourceforge.net/projects/audacity/) - Analyze sound files (mp3, m4a, whatever).
  - apt-get install audacity
- Bkhive and Samdump2 (http://sourceforge.net/projects/ophcrack/files/samdump2/) - Dump SYSTEM and SAM files.
  - apt-get install samdump2 bkhive
- CFF Explorer (http://www.ntcore.com/exsuite.php) - PE Editor.
- Creddump (https://github.com/moyix/creddump) - Dump windows credentials.
- DVCS Ripper (https://github.com/kost/dvcs-ripper) - Rips web accessible (distributed) version control systems.
- Exif Tool (http://www.sno.phy.queensu.ca/~phil/exiftool/) - Read, write and edit file metadata.
- Extundelete (http://extundelete.sourceforge.net/) - Used for recovering lost data from mountable images.
- Fibratus (https://github.com/rabbitstack/fibratus) - Tool for exploration and tracing of the Windows kernel.
- Foremost (http://foremost.sourceforge.net/) - Extract particular kind of files using headers.
  - apt-get install foremost
- Fsck.ext4 (http://linux.die.net/man/8/fsck.ext3) - Used to fix corrupt filesystems.
- Malzilla (http://malzilla.sourceforge.net/) - Malware hunting tool.
- NetworkMiner (http://www.netresec.com/?page=NetworkMiner) - Network Forensic Analysis Tool.
- PDF Streams Inflater (http://malzilla.sourceforge.net/downloads.html) - Find and extract zlib files compressed in PDF files.
- Pngcheck (http://www.libpng.org/pub/png/apps/pngcheck.html) - Verifies the integrity of PNG and dump all of the chunk-level information in human-readable form.
  - apt-get install pngcheck
- ResourcesExtract (http://www.nirsoft.net/utils/resources_extract.html) - Extract various filetypes from exes.
- Shellbags (https://github.com/williballenthin/shellbags) - Investigate NT\_USER.dat files.
- Snow (https://sbmlabs.com/notes/snow_whitespace_steganography_tool) - A Whitespace Steganography Tool.
- USBRip (https://github.com/snovvcrash/usbrip) - Simple CLI forensics tool for tracking USB device artifacts (history of USB events) on GNU/Linux.
- Volatility (https://github.com/volatilityfoundation/volatility) - To investigate memory dumps.
- Wireshark (https://www.wireshark.org) - Used to analyze pcap or pcapng files

Registry Viewers
- OfflineRegistryView (https://www.nirsoft.net/utils/offline_registry_view.html) - Simple tool for Windows that allows you to read offline Registry files from external drive and view the desired Registry key in .reg file format.
- Registry Viewer® (https://accessdata.com/product-download/registry-viewer-2-0-0) - Used to view Windows registries.

Networking

Tools used for solving Networking challenges

- Masscan (https://github.com/robertdavidgraham/masscan) - Mass IP port scanner, TCP port scanner.
- Monit (https://linoxide.com/monitoring-2/monit-linux/) - A linux tool to check a host on the network (and other non-network activities).
- Nipe (https://github.com/GouveaHeitor/nipe) - Nipe is a script to make Tor Network your default gateway.
- Nmap (https://nmap.org/) - An open source utility for network discovery and security auditing.
- Wireshark (https://www.wireshark.org/) - Analyze the network dumps.
  - apt-get install wireshark
- Zeek (https://www.zeek.org) - An open-source network security monitor.
- Zmap (https://zmap.io/) - An open-source network scanner.

Reversing

Tools used for solving Reversing challenges

- Androguard (https://github.com/androguard/androguard) - Reverse engineer Android applications.
- Angr (https://github.com/angr/angr) - platform-agnostic binary analysis framework.
- Apk2Gold (https://github.com/lxdvs/apk2gold) - Yet another Android decompiler.
- ApkTool (http://ibotpeaches.github.io/Apktool/) - Android Decompiler.
- Barf (https://github.com/programa-stic/barf-project) - Binary Analysis and Reverse engineering Framework.
- Binary Ninja (https://binary.ninja/) - Binary analysis framework.
- BinUtils (http://www.gnu.org/software/binutils/binutils.html) - Collection of binary tools.
- BinWalk (https://github.com/devttys0/binwalk) - Analyze, reverse engineer, and extract firmware images.
- Boomerang (https://github.com/BoomerangDecompiler/boomerang) - Decompile x86/SPARC/PowerPC/ST-20 binaries to C.
- ctf_import (https://github.com/docileninja/ctf_import) – run basic functions from stripped binaries cross platform.
- cwe_checker (https://github.com/fkie-cad/cwe_checker) - cwe_checker finds vulnerable patterns in binary executables.
- demovfuscator (https://github.com/kirschju/demovfuscator) - A work-in-progress deobfuscator for movfuscated binaries.
- Frida (https://github.com/frida/) - Dynamic Code Injection.
- GDB (https://www.gnu.org/software/gdb/) - The GNU project debugger.
- GEF (https://github.com/hugsy/gef) - GDB plugin.
- Ghidra (https://ghidra-sre.org/) - Open Source suite of reverse engineering tools.  Similar to IDA Pro.
- Hopper (http://www.hopperapp.com/) - Reverse engineering tool (disassembler) for OSX and Linux.
- IDA Pro (https://www.hex-rays.com/products/ida/) - Most used Reversing software.
- Jadx (https://github.com/skylot/jadx) - Decompile Android files.
- Java Decompilers (http://www.javadecompilers.com) - An online decompiler for Java and Android APKs.
- Krakatau (https://github.com/Storyyeller/Krakatau) - Java decompiler and disassembler.
- Objection (https://github.com/sensepost/objection) - Runtime Mobile Exploration.
- PEDA (https://github.com/longld/peda) - GDB plugin (only python2.7).
- Pin (https://software.intel.com/en-us/articles/pin-a-dynamic-binary-instrumentation-tool) - A dynamic binary instrumentaion tool by Intel.
- PINCE (https://github.com/korcankaraokcu/PINCE) - GDB front-end/reverse engineering tool, focused on game-hacking and automation.
- PinCTF (https://github.com/ChrisTheCoolHut/PinCTF) - A tool which uses intel pin for Side Channel Analysis.
- Plasma (https://github.com/joelpx/plasma) - An interactive disassembler for x86/ARM/MIPS which can generate indented pseudo-code with colored syntax.
- Pwndbg (https://github.com/pwndbg/pwndbg) - A GDB plugin that provides a suite of utilities to hack around GDB easily.
- radare2 (https://github.com/radare/radare2) - A portable reversing framework.
- Triton (https://github.com/JonathanSalwan/Triton/) - Dynamic Binary Analysis (DBA) framework.
- Uncompyle (https://github.com/gstarnberger/uncompyle) - Decompile Python 2.7 binaries (.pyc).
- WinDbg (http://www.windbg.org/) - Windows debugger distributed by Microsoft.
- Xocopy (http://reverse.lostrealm.com/tools/xocopy.html) - Program that can copy executables with execute, but no read permission.
- Z3 (https://github.com/Z3Prover/z3) - A theorem prover from Microsoft Research.

JavaScript Deobfuscators

- Detox (http://relentless-coding.org/projects/jsdetox/install) - A Javascript malware analysis tool.
- Revelo (http://www.kahusecurity.com/posts/revelo_javascript_deobfuscator.html) - Analyze obfuscated Javascript code.

SWF Analyzers
- RABCDAsm (https://github.com/CyberShadow/RABCDAsm) - Collection of utilities including an ActionScript 3 assembler/disassembler.
- Swftools (http://www.swftools.org/) - Collection of utilities to work with SWF files.
- Xxxswf (https://bitbucket.org/Alexander_Hanel/xxxswf) -  A Python script for analyzing Flash files.

Services

Various kind of useful services available around the internet

- CSWSH (http://cow.cat/cswsh.html) - Cross-Site WebSocket Hijacking Tester.
- Request Bin (https://requestbin.com/) - Lets you inspect http requests to a particular url.

Steganography

Tools used for solving Steganography challenges

- AperiSolve (https://aperisolve.fr/) - Aperi'Solve is a platform which performs layer analysis on image (open-source).
- Convert (http://www.imagemagick.org/script/convert.php) - Convert images b/w formats and apply filters.
- Exif (http://manpages.ubuntu.com/manpages/trusty/man1/exif.1.html) - Shows EXIF information in JPEG files.
- Exiftool (https://linux.die.net/man/1/exiftool) - Read and write meta information in files.
- Exiv2 (http://www.exiv2.org/manpage.html) - Image metadata manipulation tool.
- Image Steganography (https://sourceforge.net/projects/image-steg/) - Embeds text and files in images with optional encryption. Easy-to-use UI.
- Image Steganography Online (https://incoherency.co.uk/image-steganography) - This is a client-side Javascript tool to steganographically hide images inside the lower "bits" of other images
- ImageMagick (http://www.imagemagick.org/script/index.php) - Tool for manipulating images.
- Outguess (https://www.freebsd.org/cgi/man.cgi?query=outguess+&apropos=0&sektion=0&manpath=FreeBSD+Ports+5.1-RELEASE&format=html) - Universal steganographic tool.
- Pngtools (https://packages.debian.org/sid/pngtools) - For various analysis related to PNGs.
  - apt-get install pngtools
- SmartDeblur (https://github.com/Y-Vladimir/SmartDeblur) - Used to deblur and fix defocused images.
- Steganabara (https://www.openhub.net/p/steganabara) -  Tool for stegano analysis written in Java.
- SteganographyOnline (https://stylesuxx.github.io/steganography/) - Online steganography encoder and decoder.
- Stegbreak (https://linux.die.net/man/1/stegbreak) - Launches brute-force dictionary attacks on JPG image.
- StegCracker (https://github.com/Paradoxis/StegCracker) - Steganography brute-force utility to uncover hidden data inside files.
- stegextract (https://github.com/evyatarmeged/stegextract) - Detect hidden files and text in images.
- Steghide (http://steghide.sourceforge.net/) - Hide data in various kind of images.
- StegOnline (https://georgeom.net/StegOnline/upload) - Conduct a wide range of image steganography operations, such as concealing/revealing files hidden within bits (open-source).
- Stegsolve (http://www.caesum.com/handbook/Stegsolve.jar) - Apply various steganography techniques to images.
- Zsteg (https://github.com/zed-0xff/zsteg/) - PNG/BMP analysis.

Web

Tools used for solving Web challenges

- BurpSuite (https://portswigger.net/burp) - A graphical tool to testing website security.
- Commix (https://github.com/commixproject/commix) - Automated All-in-One OS Command Injection and Exploitation Tool.
- Hackbar (https://addons.mozilla.org/en-US/firefox/addon/hackbartool/) - Firefox addon for easy web exploitation.
- OWASP ZAP (https://www.owasp.org/index.php/Projects/OWASP_Zed_Attack_Proxy_Project) - Intercepting proxy to replay, debug, and fuzz HTTP requests and responses
- Postman (https://chrome.google.com/webstore/detail/postman/fhbjgbiflinjbdggehcddcbncdddomop?hl=en) - Add on for chrome for debugging network requests.
- Raccoon (https://github.com/evyatarmeged/Raccoon) - A high performance offensive security tool for reconnaissance and vulnerability scanning.
- SQLMap (https://github.com/sqlmapproject/sqlmap) - Automatic SQL injection and database takeover tool.
  pip install sqlmap
- W3af (https://github.com/andresriancho/w3af) -  Web Application Attack and Audit Framework.
- XSSer (http://xsser.sourceforge.net/) - Automated XSS testor.


                                                                                                                      Resources

Where to discover about CTF

Operating Systems

Penetration testing and security lab Operating Systems

- Android Tamer (https://androidtamer.com/) - Based on Debian.
- BackBox (https://backbox.org/) - Based on Ubuntu.
- BlackArch Linux (https://blackarch.org/) - Based on Arch Linux.
- Fedora Security Lab (https://labs.fedoraproject.org/security/) - Based on Fedora.
- Kali Linux (https://www.kali.org/) - Based on Debian.
- Parrot Security OS (https://www.parrotsec.org/) - Based on Debian.
- Pentoo (http://www.pentoo.ch/) - Based on Gentoo.
- URIX OS (http://urix.us/) - Based on openSUSE.
- Wifislax (http://www.wifislax.com/) - Based on Slackware.

Malware analysts and reverse-engineering

- Flare VM (https://github.com/fireeye/flare-vm/) - Based on Windows.
- REMnux (https://remnux.org/) - Based on Debian.

Starter Packs

Collections of installer scripts, useful tools

- CTF Tools (https://github.com/zardus/ctf-tools) - Collection of setup scripts to install various security research tools.
- LazyKali (https://github.com/jlevitsk/lazykali) - A 2016 refresh of LazyKali which simplifies install of tools and configuration.

Tutorials

Tutorials to learn how to play CTFs

- CTF Field Guide (https://trailofbits.github.io/ctf/) - Field Guide by Trails of Bits.
- CTF Resources (http://ctfs.github.io/resources/) -  Start Guide maintained by community.
- How to Get Started in CTF (https://www.endgame.com/blog/how-get-started-ctf) - Short guideline for CTF beginners by Endgame
- Intro. to CTF Course (https://www.hoppersroppers.org/courseCTF.html) - A free course that teaches beginners the basics of forensics, crypto, and web-ex.
- IppSec (https://www.youtube.com/channel/UCa6eh7gCkpPo5XXUDfygQQA) - Video tutorials and walkthroughs of popular CTF platforms.
- LiveOverFlow (https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w) - Video tutorials on Exploitation.
- MIPT CTF (https://github.com/xairy/mipt-ctf) - A small course for beginners in CTFs (in Russian).


Wargames

Always online CTFs

- Backdoor (https://backdoor.sdslabs.co/) - Security Platform by SDSLabs.
- Crackmes (https://crackmes.one/) - Reverse Engineering Challenges.
- CryptoHack (https://cryptohack.org/) - Fun cryptography challenges.
- echoCTF.RED (https://echoctf.red/) - Online CTF with a variety of targets to attack.
- Exploit Exercises (https://exploit-exercises.lains.space/) - Variety of VMs to learn variety of computer security issues.
- Exploit.Education (http://exploit.education) - Variety of VMs to learn variety of computer security issues.
- Gracker (https://github.com/Samuirai/gracker) - Binary challenges having a slow learning curve, and write-ups for each level.
- Hack The Box (https://www.hackthebox.eu) - Weekly CTFs for all types of security enthusiasts.
- Hack This Site (https://www.hackthissite.org/) - Training ground for hackers.
- Hacker101 (https://www.hacker101.com/) - CTF from HackerOne
- Hacking-Lab (https://hacking-lab.com/) - Ethical hacking, computer network and security challenge platform.
- Hone Your Ninja Skills (https://honeyourskills.ninja/) - Web challenges starting from basic ones.
- IO (http://io.netgarage.org/) - Wargame for binary challenges.
- Microcorruption (https://microcorruption.com) - Embedded security CTF.
- Over The Wire (http://overthewire.org/wargames/) - Wargame maintained by OvertheWire Community.
- PentesterLab (https://pentesterlab.com/) - Variety of VM and online challenges (paid).
- PicoCTF (https://2019game.picoctf.com) - All year round ctf game. Questions from the yearly picoCTF competition.
- PWN Challenge (http://pwn.eonew.cn/) - Binary Exploitation Wargame.
- Pwnable.kr (http://pwnable.kr/) - Pwn Game.
- Pwnable.tw (https://pwnable.tw/) - Binary wargame.
- Pwnable.xyz (https://pwnable.xyz/) - Binary Exploitation Wargame.
- Reversin.kr (http://reversing.kr/) - Reversing challenge.
- Ringzer0Team (https://ringzer0team.com/) - Ringzer0 Team Online CTF.
- Root-Me (https://www.root-me.org/) - Hacking and Information Security learning platform.
- ROP Wargames (https://github.com/xelenonz/game) - ROP Wargames.
- SANS HHC (https://holidayhackchallenge.com/past-challenges/) - Challenges with a holiday theme
  released annually and maintained by SANS.
- SmashTheStack (http://smashthestack.org/) - A variety of wargames maintained by the SmashTheStack Community.
- Viblo CTF (https://ctf.viblo.asia) - Various amazing CTF challenges, in many different categories. Has both Practice mode and Contest mode.
- VulnHub (https://www.vulnhub.com/) - VM-based for practical in digital security, computer application & network administration.
- W3Challs (https://w3challs.com) - A penetration testing training platform, which offers various computer challenges, in various categories.
- WebHacking (http://webhacking.kr) - Hacking challenges for web.


Self-hosted CTFs
- Damn Vulnerable Web Application (http://www.dvwa.co.uk/) - PHP/MySQL web application that is damn vulnerable.
- Juice Shop CTF (https://github.com/bkimminich/juice-shop-ctf) - Scripts and tools for hosting a CTF on OWASP Juice Shop (https://www.owasp.org/index.php/OWASP_Juice_Shop_Project) easily.

Websites

Various general websites about and on CTF

- Awesome CTF Cheatsheet (https://github.com/uppusaikiran/awesome-ctf-cheatsheet#awesome-ctf-cheatsheet-) - CTF Cheatsheet.
- CTF Time (https://ctftime.org/) - General information on CTF occuring around the worlds.
- Reddit Security CTF (http://www.reddit.com/r/securityctf) - Reddit CTF category.

Wikis

Various Wikis available for learning about CTFs

- Bamboofox (https://bamboofox.github.io/) - Chinese resources to learn CTF.
- bi0s Wiki (https://teambi0s.gitlab.io/bi0s-wiki/) - Wiki from team bi0s.
- CTF Cheatsheet (https://uppusaikiran.github.io/hacking/Capture-the-Flag-CheatSheet/) - CTF tips and tricks.
- ISIS Lab (https://github.com/isislab/Project-Ideas/wiki) - CTF Wiki by Isis lab.
- OpenToAll (https://github.com/OpenToAllCTF/Tips) - CTF tips by OTA CTF team members.

Writeups Collections

Collections of CTF write-ups

- 0e85dc6eaf (https://github.com/0e85dc6eaf/CTF-Writeups) - Write-ups for CTF challenges by 0e85dc6eaf
- Captf (http://captf.com/) - Dumped CTF challenges and materials by psifertex.
- CTF write-ups (community) (https://github.com/ctfs/) - CTF challenges + write-ups archive maintained by the community.
- CTFTime Scrapper (https://github.com/abdilahrf/CTFWriteupScrapper) - Scraps all writeup from CTF Time and organize which to read first.
- HackThisSite (https://github.com/HackThisSite/CTF-Writeups) - CTF write-ups repo maintained by HackThisSite team.
- Mzfr (https://github.com/mzfr/ctf-writeups/) - CTF competition write-ups by mzfr
- pwntools writeups (https://github.com/Gallopsled/pwntools-write-ups) - A collection of CTF write-ups all using pwntools.
- SababaSec (https://github.com/SababaSec/ctf-writeups) - A collection of CTF write-ups by the SababaSec team
- Shell Storm (http://shell-storm.org/repo/CTF/) - CTF challenge archive maintained by Jonathan Salwan.
- Smoke Leet Everyday (https://github.com/smokeleeteveryday/CTF_WRITEUPS) - CTF write-ups repo maintained by SmokeLeetEveryday team.

LICENSE

CC0 :)

ctf Github: https://github.com/apsdehal/awesome-ctf