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Eleven free Claude skills that clone any app: reverse-engineer it, rebuild it, test it for bugs, then fix what its users hate. Free, MIT.

Open source local-first PR scanner that finds dead code, security bugs, secrets, quality regressions, and AI-code mistakes before merge. For first timers refer to https://duriantaco.github.io/skylos/repo-map/

Catch API bugs before your users do

The FastLED library for colored LED animation on Arduino. Please direct questions/requests for help to the FastLED Reddit community: http://fastled.io/r We'd like to use github "issues" just for tracking library bugs / enhancements.

PHP Static Analysis Tool - discover bugs in your code without running it!

Scala 2 compiler and standard library. Scala 2 bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3

Bug Hunt Bench: 105 real bugs in two production repos, frontier coding models (GPT-6, Claude, Grok, Gemini, DeepSeek...) find and fix them in their own CLI, graded blind. Live leaderboard + every receipt.

JavaScript error handling tool for BugSnag. Monitor and report JavaScript bugs & errors.

Plugins to make or improve widescreen resolutions support in games, add more features and fix bugs.

Official repository for the Bugzilla bug tracking system. Report bugs to https://bugzilla.mozilla.org/enter_bug.cgi?product=Bugzilla&format=__default__ . Main website:

Mozilla code search website. (Please file bugs in bugzilla at https://mzl.la/2YtXmoN)

Vulnerable Nodejs — a real shop (NodeBazaar) intentionally full of security bugs. 14 labs, OWASP Top 10:2025, SAST benchmark. Node.js port of DVWA.

Puma Scan is a software security Visual Studio extension that provides real time, continuous source code analysis as development teams write code. Vulnerabilities are immediately displayed in the development environment as spell check and compiler warnings, preventing security bugs from entering your applications.

SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.

Official MAAS repository. Bugs are tracked on Launchpad: https://bugs.launchpad.net/maas

Automatic conversion of the NetBSD src CVS module, use with care. Please submit bugs/changes via https://gnats.NetBSD.org. NOTE: Links to commits here WILL ROT. Use https://nxr.NetBSD.org or https://cvsweb.NetBSD.org links instead.

Mutation testing resources: how to make better code by introducing bugs

undercover warns about methods, classes and blocks that were changed without tests, to help you easily find untested code and reduce the number of bugs. It does so by analysing data from git diffs, code structure and SimpleCov coverage reports

Allow users to easily share Diagnostics with your support team to improve the flow of fixing bugs.

GNU Octave Mirror (https://www.octave.org/hg/octave). Report bugs and submit pull requests (patches) at https://bugs.octave.org

Automated online client for the Flesh and Blood card game. There may be bugs, so the site should not be used as an indication of how the game works. Game interactions and rulings are the jurisdiction of LSS and judges.

Native WebGPU implementation. Mirror of https://dawn.googlesource.com/dawn. File bugs here: https://crbug.com/dawn/new

CanvasMC is a fork of the Folia Minecraft server software that fixes gameplay inconsistencies, bugs, and introduces further performance enhancements to the dedicated server

Specula: An agentic tool for finding deep bugs in system code using TLA+

Earn RTC crypto by contributing to the RustChain ecosystem. Bounties from 1-150 RTC. Star, code, write tutorials, find bugs.

A benchmark and harness for finding and exploiting smart contract bugs

Adversarial AI bug hunter with auto-fix skill for Claude Code, Cursor, Codex CLI, GitHub Copilot CLI, Kiro CLI, Opencode, Pi Coding Agent, and more. Multi-agent pipeline finds security vulnerabilities, logic errors, and runtime bugs — then fixes them autonomously on a safe branch.

Autonomous code auditor that keeps digging until it finds and proves real bugs.

An AI coding agent that reads your code, edits files, runs commands, and reasons through bugs — across a terminal REPL, a full-screen TUI, and a browser UI, while you keep your hand on every permission.

Review code. Patch bugs. Land PRs.