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

#7GitHubDaily/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.

#8streamlit/streamlit

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

#9files-community/Files

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

#10usebruno/bruno

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

#11appsmithorg/appsmith

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

#12koalaman/shellcheck

ShellCheck, a static analysis tool for shell scripts

#13agno-agi/agno

Build, run, manage agentic software at scale.

#14freeCodeCamp/devdocs

API Documentation Browser

#15lapce/lapce

Lightning-fast and Powerful Code Editor written in Rust

#16httpie/cli

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

#17CorentinTh/it-tools

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

#18sxyazi/yazi

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

#19refinedev/refine

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

#20Pythagora-io/gpt-pilot

The first real AI developer

#21TabbyML/tabby

Self-hosted AI coding assistant

#22continuedev/continue

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

#23surrealdb/surrealdb

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

#24DevToys-app/DevToys

A Swiss Army knife for developers.

#25GoogleChrome/lighthouse

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

#26voideditor/void

#27ComposioHQ/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.

#28sickn33/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.

#29responsively-org/responsively-app

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

#30marimo-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.

#31dailydotdev/daily

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

#32Avaiga/taipy

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

#33SWE-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]

#34wavetermdev/waveterm

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

#35source-foundry/Hack

A typeface designed for source code

#36GoogleContainerTools/skaffold

Easy and Repeatable Kubernetes Development

#37treeverse/dvc

🦉 Data Versioning and ML Experiments

#38iii-hq/iii

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

#39plandex-ai/plandex

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

#40loft-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.

#41superset-sh/superset

Code Editor for the AI Agents Era - Run an army of Claude Code, Codex, etc. on your machine

#42rtk-ai/rtk

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

#43gruntwork-io/terragrunt

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

#44httpie/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

#45voidcosmos/npkill

List any node_modules 📦 dir in your system and how heavy they are. You can then select which ones you want to erase to free up space 🧹

#46iib0011/omni-tools

Self-hosted collection of powerful web-based tools for everyday tasks. No ads, no tracking, just fast, accessible utilities right from your browser!

#47karatelabs/karate

Test Automation Made Simple

#48insidegui/WWDC

The unofficial WWDC app for macOS

#49metalbear-co/mirrord

Connect your local process and your cloud environment, and run local code in cloud conditions.

#50devspace-sh/devspace

DevSpace - The Fastest Developer Tool for Kubernetes ⚡ Automate your deployment workflow with DevSpace and develop software directly inside Kubernetes.