Best Open Source developer tools Libraries

#1puppeteer/puppeteer

JavaScript API for Chrome and Firefox

#2hoppscotch/hoppscotch

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

#3OpenHands/OpenHands

🙌 OpenHands: AI-Driven Development

#4localstack/localstack

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

#5daytonaio/daytona

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

#6affaan-m/everything-claude-code

Complete Claude Code configuration collection - agents, skills, hooks, commands, rules, MCPs. Battle-tested configs from an Anthropic hackathon winner.

#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

#13freeCodeCamp/devdocs

API Documentation Browser

#14lapce/lapce

Lightning-fast and Powerful Code Editor written in Rust

#15agno-agi/agno

The programming language for agentic software. Build, run, and manage multi-agent systems at scale.

#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.

#18refinedev/refine

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

#19Pythagora-io/gpt-pilot

The first real AI developer

#20sxyazi/yazi

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

#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.

#28responsively-org/responsively-app

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

#29terrastruct/d2

D2 is a modern diagram scripting language that turns text to diagrams.

#30yamadashy/repomix

📦 Repomix is a powerful tool that packs your entire repository into a single, AI-friendly file. Perfect for when you need to feed your codebase to Large Language Models (LLMs) or other AI tools like Claude, ChatGPT, DeepSeek, Perplexity, Gemini, Gemma, Llama, Grok, and more.

#31nocobase/nocobase

NocoBase is the most extensible AI-powered no-code/low-code platform for building business applications and enterprise solutions.

#32jarun/nnn

n³ The unorthodox terminal file manager

#33liriliri/eruda

Console for mobile browsers

#34dailydotdev/daily

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

#35marimo-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.

#36Avaiga/taipy

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

#37SWE-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]

#38wavetermdev/waveterm

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

#39loft-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.

#40zealdocs/zeal

Offline documentation browser inspired by Dash

#41illacloud/illa-builder

Low-code platform allows you to build business apps, enables you to quickly create internal tools such as dashboard, crud app, admin panel, crm, cms, etc. Supports PostgreSQL, MySQL, Supabase, GraphQL, MongoDB, MSSQL, Rest API, Hugging Face, Redis, etc. Automate workflows with schedule or webhook. Open source Retool.

#42Automattic/harper

Offline, privacy-first grammar checker. Fast, open-source, Rust-powered

#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 🧹

#46karatelabs/karate

Test Automation Made Simple

#47insidegui/WWDC

The unofficial WWDC app for macOS

#48iib0011/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!

#49watchexec/watchexec

Executes commands in response to file modifications

#50massCodeIO/massCode

A free and open source code snippet manager for developers