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Best Open Source developer tools Libraries

A curated list of the most popular GitHub repositories tagged with developer tools. Select any project to visualize its architecture and dive into the codebase using GitPulse's AI engine.

#1affaan-m/everything-claude-code

The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.

178,661JavaScript
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#2puppeteer/puppeteer

JavaScript API for Chrome and Firefox

94,294TypeScript
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#3ComposioHQ/composio

Composio powers 1000+ toolkits, tool search, context management, authentication, and a sandboxed workbench to help you build AI agents that turn intent into action.

28,149TypeScript
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#4mvanhorn/cli-printing-press

Every API has a secret identity. This finds it, absorbs every feature from every competing tool, then builds the GOAT CLI — designed for AI agents first, with SQLite sync, offline search, and compound insight commands.

1,470Go
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#5esengine/DeepSeek-Reasonix

DeepSeek-native AI coding agent for your terminal. Engineered around prefix-cache stability — leave it running.

1,144TypeScript
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#6scalacenter/bloop

Bloop is a build server and CLI tool to compile, test and run Scala fast from any editor or build tool.

939Scala
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#7liaohch3/claude-tap

Intercept and inspect API traffic from Claude Code, Codex CLI, OpenCode, and Cursor CLI in a trace viewer.

284Python
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#8403errors/repomind

An open-source, AI-powered application using Agentic CAG to chat with any public GitHub repository or developer profile, offering deep code analysis, visual architecture maps and security audits

246TypeScript
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#9hverlin/mise-vscode

VS Code extension for mise-en-place (https://mise.jdx.dev/)

204TypeScript
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