Best Open Source developer tools Libraries

#1morluto/rea

Reverse engineer anything with agents, from app behavior down to native binaries.

#2puppeteer/puppeteer

JavaScript API for Chrome and Firefox

#3affaan-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.

#4hoppscotch/hoppscotch

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

#5OpenHands/OpenHands

🙌 OpenHands: AI-Driven Development

#6daytonaio/daytona

Daytona is a Secure and Elastic Infrastructure for Running AI-Generated Code

#7localstack/localstack

💻 A fully functional local AWS cloud stack. Develop and test your cloud & Serverless apps offline

#8sickn33/agentic-awesome-skills

AAS Core is the local, agent-first control plane for complete catalog discovery, agent-owned selection, stack validation, and planning, backed by 2,600+ agentic skills. Includes CLI, local MCP, catalog, plugins, and Workbench.

#9GitHubDaily/GitHubDaily

坚持分享 GitHub 上高质量、有趣实用的开源技术教程、开发者工具、编程网站、技术资讯。A list cool, interesting projects of GitHub.

#10streamlit/streamlit

Streamlit — A faster way to build and share data apps.

#11files-community/Files

A modern file manager that helps users organize their files and folders.

#12usebruno/bruno

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

#13codewhale-hq/Codewhale

Open-source Rust agent engine and terminal client for Codewhale, with provider choice, tools, approvals and receipts.

#14appsmithorg/appsmith

Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.

#15koalaman/shellcheck

ShellCheck, a static analysis tool for shell scripts

#16agno-agi/agno

Build, run, manage agentic software at scale.

#17freeCodeCamp/devdocs

API Documentation Browser

#18lapce/lapce

Lightning-fast and Powerful Code Editor written in Rust

#19httpie/cli

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.

#20CorentinTh/it-tools

Collection of handy online tools for developers, with great UX.

#21esengine/DeepSeek-Reasonix

A reliable coding agent for complex software engineering tasks.

#22sxyazi/yazi

💥 Blazing fast terminal file manager written in Rust, based on async I/O.

#23refinedev/refine

A React Framework for building internal tools, admin panels, dashboards & B2B apps with unmatched flexibility.

#24Pythagora-io/gpt-pilot

The first real AI developer

#25TabbyML/tabby

Self-hosted AI coding assistant

#26continuedev/continue

⏩ Source-controlled AI checks, enforceable in CI. Powered by the open-source Continue CLI

#27surrealdb/surrealdb

A scalable, distributed, collaborative, document-graph database, for the realtime web

#28DevToys-app/DevToys

A Swiss Army knife for developers.

#29GoogleChrome/lighthouse

Automated auditing, performance metrics, and best practices for the web.

#30QwenLM/qwen-code

An open-source AI coding agent that lives in your terminal.

#31voideditor/void

#32ComposioHQ/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.

#33Ebony-Vinyl/dsh-our-free-model

在 dsh 里装上这个插件即可，无需登录、注册或填 API Key，就能使用包括 DeepSeek V4.1 Flash、Kimi K3 在内的前沿模型——完全免费，不限量。 All you do is install this plugin in dsh: no login, no sign-up, no API key — the frontier models are just there, DeepSeek V4.1 Flash and Kimi K3 among them. Completely free, with no usage cap.

#34sickn33/antigravity-awesome-skills

The Ultimate Collection of 1000+ Agentic Skills for Claude Code/Antigravity/Cursor. Battle-tested, high-performance skills for AI agents including official skills from Anthropic and Vercel.

#35responsively-org/responsively-app

A modified web browser that helps in responsive web development. A web developer's must have dev-tool.

#36coleam00/Archon

The first open-source harness builder for AI coding. Make AI coding deterministic and repeatable.

#37getpaseo/paseo

Orchestrate multiple coding agents from desktop and mobile

#38marimo-team/marimo

A reactive notebook for Python — run reproducible experiments, query with SQL, execute as a script, deploy as an app, and version with git. Stored as pure Python. All in a modern, AI-native editor.

#39dailydotdev/daily

daily.dev is a professional network for developers to learn, collaborate, and grow together 👩🏽‍💻 👨‍💻

#40Avaiga/taipy

Turns Data and AI algorithms into production-ready web applications in no time.

#41SWE-agent/SWE-agent

SWE-agent takes a GitHub issue and tries to automatically fix it, using your LM of choice. It can also be employed for offensive cybersecurity or competitive coding challenges. [NeurIPS 2024]

#42wavetermdev/waveterm

An open-source, AI-integrated, cross-platform terminal for seamless workflows

#43source-foundry/Hack

A typeface designed for source code

#44GoogleContainerTools/skaffold

Easy and Repeatable Kubernetes Development

#45treeverse/dvc

🦉 Data Versioning and ML Experiments

#46iii-hq/iii

iii (pronounced “three eye”) unifies your existing backend stack with a single engine and three primitives: Function, Worker, and Trigger.

#47plandex-ai/plandex

Open source AI coding agent. Designed for large projects and real world tasks.

#48loft-sh/devpod

Codespaces but open-source, client-only and unopinionated: Works with any IDE and lets you use any cloud, kubernetes or just localhost docker.

#49OrchestratorInc/agent-orchestrator

Open-source (Apache-2.0) orchestrator for Claude Code, Codex & 30+ coding agents. Plan, run and supervise agent teams from task to merged PR. Desktop (macOS, Windows, Linux) + iPhone & Android apps.

#50omnigent-ai/omnigent

Omnigent is an open-source AI agent framework and meta-harness: orchestrate Claude Code, Codex, Cursor, Pi, and custom agents — swap harnesses without rewriting, enforce policies and sandboxing, and collaborate in real time from any device.