category
Open Source Developer Tools
Better tooling, zero license servers
All Developer Tools
AI coding agent for terminal, IDE, and desktop
Visual builder for AI agents and RAG pipelines
Postgres-powered backend platform for production apps
Minimal terminal coding agent you can fully customize
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Hyperextensible, Lua-powered Vim-based text editor
High-performance code editor built for speed and AI
Autonomous coding agents that complete real engineering tasks
Next generation frontend tooling. It's fast!
Org chart, budgets, and governance for AI agent teams
Sleek, intuitive API development and testing platform
Run multiple AI coding agents in parallel, side by side
Open-source AI coding agent for your editor and terminal
A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Throug
High-performance terminal with GPU acceleration
A modern terminal built around AI coding agents
Fast GPU-accelerated terminal with native UI design
Open-source backend in a single file
Self-hosted Git service for seamless collaboration
Open-source backend platform for rapid app development
AI pair programmer that works inside your terminal
Self-hosted Git service that's lightweight and easy to install
Lightweight, fast, and open-source API client for developers
The zero configuration build tool for the web. 📦🚀
Build internal tools rapidly without coding
Empower your team to build custom internal tools rapidly
Powerful API development and testing made effortless
Craft rich text experiences with ease
End-to-end open source software delivery platform
Open-source data platform for effortless content management
LLM API 管理 & 分发系统,支持 OpenAI、Azure、Anthropic Claude、Google Gemini、DeepSeek、字节豆包、ChatGLM、文心一言、讯飞星火、通义千问、360 智脑、腾讯混元等主流模型,统一 API 适配,可用于 key 管理与二次分发。单可执行文件,提供 Docke
Open-source coding agent for your IDE and terminal
Organize terminal sessions with built-in layouts, tabs, and panes
GPU-accelerated terminal built for power users
Fast, efficient, battle-tested at Alibaba's scale. Hybrid architecture code review tool: deterministic pipelines + LLM Agent, precise line-level comments, built
AI-powered code completion for seamless development
Self-hosted mini-PaaS for deploying applications easily
Local-first code intelligence graph for MCP and CLI. Builds a persistent map of your codebase so AI coding tools read only what matters, with benchmarked contex
The OpenAPI Specification Repository
Build system optimized for JavaScript and TypeScript, written in Rust
The Monorepo Platform that amplifies both developers and AI agents. Nx optimizes your builds, scales your CI, and fixes failed PRs automatically. Ship in half t
GPU-accelerated terminal emulator with multiplexing across all platforms
Full-stack Python platform for web apps and internal tools
Build powerful web apps without complex coding
AI coding agent for VS Code, JetBrains, CLI, and Cloud
AI coding agent and CLI for complex terminal workflows
Visual React editor with real-time code updates
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec
📘 OpenAPI/Swagger-generated API Reference Documentation
AI-powered DevSecOps for faster, secure software delivery
Build custom apps without code, deploy with ease
A native code editor for macOS
AI-powered coding made simple and efficient
SafeLine is a self-hosted WAF(Web Application Firewall) / reverse proxy to protect your web apps from attacks and exploits.
Cross-platform terminal with AI built in
Flexible database meets intuitive spreadsheet interface
Mobile Security Framework (MobSF) is an automated, all-in-one mobile application (Android/iOS/Windows) pen-testing, malware analysis and security assessment fra
Revolutionize your Git workflow with simultaneous branches
Build unlimited AI apps locally with zero vendor lock-in
Create, customize, and manage your website with ease
AI agents that autonomously fix code and resolve GitHub issues
gRPC to JSON proxy generator following the gRPC HTTP spec
Fast, secure, offline API client with Git integration
Hurl, run and test HTTP requests with plain text.
Adaptable, fast automation for all
Advanced terminal with modern features for Mac developers
Run coding agents from your phone, desktop, or terminal
High-performance API gateway with built-in LLM support
Open-source API documentation and testing platform
Fast, secure cloud development environments on your infrastructure
Run dozens of AI coding agents in parallel on your machine
The developer platform for on-demand cloud development environments to create software faster and more securely.
🚀 PR Agent: The Original Open-Source PR Reviewer. This project is not the Qodo free tier.
Automatically generate RESTful API documentation with Swagger 2.0 for Go.
Fast Rust-based bundler for the web with a modernized webpack API 🦀
Build full-stack apps with TypeScript and real-time sync
Accelerate backend development with effortless scalability
Instant, easy, and predictable development environments
🔥 A cross-platform build utility based on Lua
Build product integrations with 500+ APIs in hours
Expose your FastAPI endpoints as Model Context Protocol (MCP) tools, with Auth!
Python Serverless Microframework for AWS
Build and deploy scalable storefronts with ease
Universal API management for REST, GraphQL, gRPC & async
⚡ Next-gen Web Extension Framework
Common layer for composing and governing AI agents
Flexible, scalable Node.js CMS and app framework
🐶 Automated code review tool integrated with any code analysis tools regardless of programming language
🤖 AI Gateway | AI Native API Gateway
Review-first terminal diff viewer for agentic coders
Serverless backend platform for modern app development
💨 Fast, Async-ready, Openapi, type hints based framework for building APIs
🕸️ Create REST and GraphQL APIs, scaffold Jamstack webapps, stream changes in real-time.
Create powerful forms with ease and flexibility
Visual web development with code-level control
Test Automation Made Simple
Apache ShenYu is a Java native API Gateway for service proxy, protocol conversion and API governance.
Visual development platform for modern web experiences
Annotate and review coding agent plans and code diffs visually, share with your team, send feedback to agents with one click.
.NET API Gateway
Light, flexible and extensible ASGI framework | Built to scale
Flexible e-commerce for modern businesses
Effortless API mocking for seamless development
Generate TypeScript types from OpenAPI 3 specs
🦸 AI 编程超能力 · 中文增强版 — superpowers(250k+ ⭐)完整汉化 + 4 个中国原创 skills,让 Claude Code / Copilot CLI / Hermes Agent / Cursor / Windsurf / Kiro / Gemini CLI / Qoder 等 26
Open-source cloud communications platform for developers
Friendly and fast tool for sending HTTP requests
Open-source serverless CMS for modern web projects
The Modern Application Platform.
Simple yet powerful CI/CD engine with great extensibility
🍔 A Node.js Serverless Framework for front-end/full-stack developers. Build the application for next decade. Works on AWS, Alibaba Cloud, Tencent Cloud and tra
A highly extensible Git implementation in pure Go.
OWASP dependency-check is a software composition analysis utility that detects publicly disclosed vulnerabilities in application dependencies.
An extremely fast CSS parser, transformer, bundler, and minifier written in Rust.
Terminal-native AI coding agent built on ZSH
The modern GraphQL runtime
Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API
A tool for mocking HTTP services
The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.
DeepAudit:人人拥有的 AI 黑客战队,让漏洞挖掘触手可及。国内首个开源的代码漏洞挖掘多智能体系统。小白一键部署运行,自主协作审计 + 自动化沙箱 PoC 验证。支持 Ollama 私有部署 ,一键生成报告。支持中转站。让安全不再昂贵,让审计不再复杂。
Build powerful backends without leaving your browser
Self-hosted AI gateway for multi-channel, multi-credential setups — API keys and subscription accounts, scheduling, failover, request logs and usage. 自托管 AI 网关:
CLI tool to build, test, debug, and deploy Serverless applications using AWS SAM
The tiniest PaaS you've ever seen. Piku allows you to do git push deployments to your own servers.
Generate compile_commands.json for any C or C++ build
A RWKV management and startup tool, full automation, only 8MB. And provides an interface compatible with the OpenAI API. RWKV is a large language model that is
Build stateful backends with in-memory actors
Design-first Go framework that generates API code, documentation, and clients. Define once in an elegant DSL, deploy as HTTP and gRPC services with zero drift b
A payment application to demonstrate real-world usage of Cypress testing methods, patterns, and workflows.
Super-fast/easy runtime validators and serializers via transformation
A Cloud Native traffic orchestration system. (CNCF Project)
Open-source auth gateway connecting 1500+ SaaS providers to AI agents through SDK, CLI, MCP, HTTP, and OpenAPI.
Dashboard for running multiple coding agents in parallel
The Cloud-Native API Gateway and AI Gateway
Official Notion JavaScript Client
Typesafe APIs Made Simple 🪄
Extremely fast Vite-compatible web build tool written in Rust
👨🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode,
Open source and extensible Platform as a Service (PaaS).
Run Express and other Node.js frameworks on AWS Serverless technologies such as Lambda, API Gateway, Lambda@Edge, and more.
The cross-browser extension framework.
Fullstack Workspace for Humans & Machines
package for building REST-style Web Services using Go
Open-source data integration for modern stacks
A progressive web framework based on React and Rsbuild.
MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1,
sbt, the interactive build tool
An API Gateway built on Spring Framework and Spring Boot providing routing and more.
Next Generation Agentic Proxy for AI Agents and MCP servers
Build reliable AI agents with unified tool integration
A build system for creating cross-platform styles.
OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, PowerShell, Go, Java, Node.js, TypeScript, Python
The first AI agent that builds permissionless integrations through reverse engineering platforms' internal APIs.
Deploy apps instantly with git push - open source alternative
open source Kubernetes-native API gateway for microservices built on the Envoy Proxy
An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and
Build, bundle & ship your Rust WASM application to the web.
Optimizing inference proxy for LLMs
:cake: Cake (C# Make) is a cross platform build automation system.
scanner detecting the use of JavaScript libraries with known vulnerabilities. Can also generate an SBOM of the libraries it finds.
Create stunning data visualizations with ease
A next-gen FOSS self-hosted unified zero trust secure access platform that can operate as a remote access VPN, a ZTNA platform, API/AI/MCP gateway, a PaaS, an n
Modern command-line HTTP client for the API era
🛵 The stylish Node.js middleware engine for AWS Lambda 🛵
Deploy Node.js projects to AWS Lambda and API Gateway easily
The Pants Build System
An API Client package to access the APIs for NBA.com
Feature-rich backend that runs anywhere you need it
A simple API client (postman like) in your terminal
The power of curl, the ease of use of httpie.
Create powerful forms with ease and flexibility
Serverless Python
Java client for Kubernetes & OpenShift
ProGuard, Java optimizer and obfuscator
Catch API bugs before your users do
Fast, extensible build tool for modern web development
PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs
Microservices on .NET platforms used ASP.NET Web API, Docker, RabbitMQ, MassTransit, Grpc, Yarp API Gateway, PostgreSQL, Redis, SQLite, SqlServer, Marten, Entit
OpenAI API + Ruby! 🤖❤️ GPT-5 & Realtime WebRTC compatible!
a code review TUI with vim keybindings
AI API identity gateway — reverse proxy that normalizes device fingerprints and telemetry for privacy-preserving API proxying
Manages Envoy Proxy as a Standalone or Kubernetes-based Application Gateway
Turn Windsurf / Devin Desktop's 100+ AI models (Claude, GPT, Gemini, DeepSeek, Kimi, GLM, SWE) into OpenAI-, Anthropic- & Gemini-compatible APIs. Zero-dependenc
Free, open-source visual website builder for designers
Rust task runner and build tool.
API Dash is a beautiful AI-powered open-source cross-platform (Desktop & Mobile) API Client built using Flutter which can help you easily create & customize you
A better build tool for Java, Scala and Kotlin: Simpler than Maven, easier than Gradle, with 3-7x faster dev workflows than other JVM build tools
Offline-First Minimalistic HTTP & Socket Testing Client for the Web & Desktop
Blazing-fast API gateway with linear scalability
High-performance extensible build system for reproducible multi-language builds.
Unified API development ecosystem for modern teams
nodejsscan is a static security code scanner for Node.js applications.
SCons - a software construction tool
Visual website builder for effortless web design
Build AI (or any) apps with scalable microservices & microfrontends.
A cryptographically verifiable code review system for the cargo (Rust) package manager.
👻 Proxy API gateway for Kiro IDE & CLI (Amazon Q Developer / AWS CodeWhisperer). Use free Claude models with any client.
🐧 Harness for RSI. Let AI Build AI. Multi-Agent Auto-Dev Platform. Everything is Transparent.
Open source API management platform
Notion API client SDK, rewritten in Python! (sync + async)
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
Terminal API client for HTTP, GraphQL and gRPC. Plain .http files you can diff and version, with workflows, mocks, profiling, tracing, OpenAPI import, SSH tunne
AI-native software testing platform — one YAML test language covering API, Web, mobile, messaging, data, and LLM scenarios. Self-hostable.
:fire: Serverless Devs: Serverless developer tool ( Serverless Devs: Serverless 开发者工具 )
Code with Claude, Codex, Gemini, and more in one workspace
Generate automated tests for your Node.js app via LLMs without developers having to write a single line of code.
Build APIs like code with Git-native workspace
An open, distributed platform as a service
An extensible and friendly code review tool for projects and companies of all sizes.
WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java,
Open source CI/CD platform that's faster and costs less
A modular, stack-agnostic toolkit of security review skills for AI coding agents to autonomously find, reproduce, and patch vulnerabilities.
AI code review that learns your team's standards
C++ Discord API Bot Library - D++ is Lightweight and scalable for small and huge bots!
⚡️ A fully-featured and blazing-fast JavaScript API client to interact with Algolia.
Smocker is a simple and efficient HTTP mock server and proxy
Parallel AI agent workspaces with Git and project context
Unify APIs, databases, and services effortlessly
Self-hosted AI agents and workflows across any channel
Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
AI agent workflows built natively into GitHub
Open source CMS with powerful drag-and-drop builder
Autoprompt is a coding-agent skill that cuts failures by 45% on agentic coding tasks.
Deploy, use, and share web apps on a server you control. Your apps, data, and infrastructure stay yours.
Open-source testing agent for UI, API, security, accessibility & visual QA
Flexible CMS for developers, powerful for clients
Your feedback loop with the agent
Lightning-fast React data grid for enterprise scale
AI writes code. This automates everything else · 24 plugins · 49 agents · 44 skills · for Claude Code, OpenCode, Codex, Cursor, Kiro.
Open-source, self-hosted AI app builder — an agent builds real apps in isolated sandboxes on your own server, each live at a preview URL. Self-host in one comma
All-in-one native macOS AI chat application for virtually any AI provider
Mock everything your AI app talks to — LLM APIs, MCP, A2A, AG-UI, vector DBs, search. One package, one port, zero dependencies.
Node.js & JavaScript SDK for Binance REST APIs & WebSockets, with TypeScript & browser support, integration tests, beautification & more.
Self-hosted lightweight PaaS solution to deploy and manage your applications on any VPS [Your own self-hosted Heroku, Vercel]
Powerful friendly HTTP mock server & proxy library
A simple and extensible behavioural testing library for Go. You can use api test to simplify REST API, HTTP handler and e2e tests.
Fast, local-first Git GUI built in Rust
Simulate API failures, throttling, and chaos — all from your command line.
Build complete web apps with integrated graph database
:boom: Test REST, GraphQL APIs
A delightfully rich and dynamic link-in-bio.
Cloud-agnostic managed Kubernetes
DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at
Cell is a Serverless First, componentized, platform-independent progressive application framework based on TypeScript. Cell 是基于 TypeScript 的 Serverless First、组件
Official master for the Greenmail project
An open-source automation tool that simplifies the deployment of your apps on Kubernetes.
AI coding agent that sees your live app and edits code
Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽🚀
A platform that helps you deploy services with one click.
Backend.AI is a streamlined, container-based computing cluster platform that hosts popular computing/ML frameworks and diverse programming languages, with plugg
HTTP mocking library for Rust
runn is a package/tool for running operations following a scenario.
Visual regression testing for seamless UI development
REST API Testing Tool for all levels in a Test Pyramid
A TypeScript-native acceptance testing framework that gives your Playwright Test, WebdriverIO, or Cucumber test suite the architecture it needs to scale.
Opinionated platform that runs on Kubernetes, that takes you from App to URL in one step.
Build and deploy AI agents through visual workflows
A Git source code management tool powered by Elixir with easy installation & high extensibility.
mocker-api that creates mocks for REST APIs. It will be helpful when you try to test your application without the actual REST API server.
Craft AAA web apps that delight your users
Open-source GraphQL federation platform
Unified API, event, and AI agent management platform
Simplify project management for developers
Low-code and no-code platform for business apps
Connect APIs, databases, and streams without glue code
Visual website builder and CMS you can self-host
Deploy web apps with automated CI/CD and full infrastructure control
Self-hosted AI coding agent that opens real PRs
OTA updates for Capacitor apps without app store delays
Secure, encrypted forms with advanced features
Secure AI API management for iOS apps with DeviceCheck
Self-hosted Git forge that's lightweight and secure
Frequently asked questions
How many open source Developer Tools tools are there?
This registry tracks 272 open source Developer Tools projects, with 4,110,147 combined GitHub stars. The list is ranked by stars and refreshed nightly.
What is the most popular open source Developer Tools project?
OpenCode leads this category with 208,150 GitHub stars, followed by Langflow.
Are these Developer Tools tools free?
Yes — every project listed here is open source. Some also offer paid hosted versions alongside the free self-hosted option; the licence for each project is shown on its card.