Open source. Open possibilities.

Reel generates always-current demo films for web apps and CLIs from a YAML spec. It drives a real browser or terminal, records the actual flow, and renders GIF, MP4, WebM, storyboards, and interactive HTML compositions. Works via CLI, Studio UI, or Claude Code plugin. Fails CI when demos break.

ripr is a static mutation-exposure analysis tool that identifies changed behavior your tests reach but don't actually verify, without running mutation testing.

RecurSpec is a Node.js command-line testing tool that checks whether the recovery instructions in error messages actually resolve the original failure, running each case in an isolated temporary workspace and blocking unsafe commands.

Tach is a Rust-powered Python tool designed to visualize and enforce dependency boundaries and interfaces within a modular architecture.

Run GitHub Actions workflows locally using Docker, with fast feedback and the ability to replace Makefiles.

Harness Open Source is an end-to-end developer platform combining source control management, CI/CD pipelines, hosted developer environments (Gitspaces) and artifact registries, runnable locally via Docker.

reviewdog is an automated code review tool that integrates with any linter or code analysis tool regardless of programming language. It filters findings by diff and posts review comments to GitHub, GitLab, Bitbucket, and other code hosting services via CI pipelines.

gha-doctor is a zero-config CLI that diagnoses GitHub Actions workflows for flaky jobs, wasted minutes, slow steps, cache problems and anti-patterns, with static lint rules, run-history analysis, a health score badge, auto-fixes, SARIF/HTML/JSON reports, a GitHub Action and an MCP server.

A comprehensive open-source Chinese classical poetry database containing 55,000 Tang poems, 260,000 Song poems, 21,000 Song ci, and other classical collections in JSON format for developers.