Best Open Source developer tools Libraries

#1puppeteer/puppeteer

JavaScript API for Chrome and Firefox

#2affaan-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.

#3hoppscotch/hoppscotch

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

#4OpenHands/OpenHands

🙌 OpenHands: AI-Driven Development

#5daytonaio/daytona

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

#6localstack/localstack

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

#7sickn33/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 2,005+ agentic skills. Includes CLI, local MCP, catalog, plugins, and Workbench.

#8GitHubDaily/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.

#9streamlit/streamlit

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

#10files-community/Files

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

#11usebruno/bruno

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

#12appsmithorg/appsmith

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

#13koalaman/shellcheck

ShellCheck, a static analysis tool for shell scripts

#14agno-agi/agno

Build, run, manage agentic software at scale.

#15freeCodeCamp/devdocs

API Documentation Browser

#16lapce/lapce

Lightning-fast and Powerful Code Editor written in Rust

#17httpie/cli

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

#18CorentinTh/it-tools

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

#19sxyazi/yazi

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

#20refinedev/refine

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

#21Pythagora-io/gpt-pilot

The first real AI developer

#22TabbyML/tabby

Self-hosted AI coding assistant

#23continuedev/continue

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

#24surrealdb/surrealdb

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

#25DevToys-app/DevToys

A Swiss Army knife for developers.

#26GoogleChrome/lighthouse

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

#27voideditor/void

#28QwenLM/qwen-code

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

#29ComposioHQ/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.

#30sickn33/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.

#31responsively-org/responsively-app

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

#32coleam00/Archon

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

#33marimo-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.

#34dailydotdev/daily

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

#35Avaiga/taipy

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

#36SWE-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]

#37wavetermdev/waveterm

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

#38source-foundry/Hack

A typeface designed for source code

#39GoogleContainerTools/skaffold

Easy and Repeatable Kubernetes Development

#40getpaseo/paseo

Orchestrate multiple coding agents from desktop and mobile

#41treeverse/dvc

🦉 Data Versioning and ML Experiments

#42iii-hq/iii

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

#43plandex-ai/plandex

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

#44loft-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.

#45lidge-jun/opencodex

Universal provider proxy for OpenAI Codex & Claude Code — use any LLM (Claude, Gemini, Grok, DeepSeek, Ollama…) with Codex CLI, App, SDK, and Claude Code

#46semantica-agi/semantica

Graph-Native Infrastructure for Context and Accountable AI Systems

#47omnigent-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.

#48rtk-ai/rtk

CLI proxy that reduces LLM token consumption by 60-90% on common dev commands. Single Rust binary, zero dependencies

#49gruntwork-io/terragrunt

Terragrunt is a flexible orchestration tool that allows Infrastructure as Code written in OpenTofu/Terraform to scale.

#50httpie/http-prompt

An interactive command-line HTTP and API testing client built on top of HTTPie featuring autocomplete, syntax highlighting, and more. https://twitter.com/httpie