Best open-source Developer Tools projects

An MCP server that lets AI agents reverse engineer native binaries, JavaScript/Electron apps, .NET assemblies, websites and more, with evidence for each finding.

A feature-rich command-line tool for downloading audio and video from thousands of websites, forked from youtube-dl.

An agent skill that turns ideas, plans, or codebases into interactive HTML diagrams, working with Claude Code, Codex, Cursor, and OpenCode.

A desktop app for managing, syncing and backing up AI agent skills across Claude Code, Codex, Cursor, Copilot, Gemini CLI and dozens of other coding tools.

A Rust command-line tool that fetches data from dozens of websites such as Bilibili, Reddit and Hacker News with a single command.

A terminal and browser viewer that draws Claude Code and Codex sessions as a live flow graph of agents and tool calls.

A shell script that cleans caches, logs, temp files and other clutter from macOS, as a free alternative to paid cleaner apps.

An agent skill that turns a short JSON spec into animated, explorable diagrams exported as HTML, SVG, PNG, GIF or MP4.