category

Open Source Developer Tools

Better tooling, zero license servers

projects 272 combined stars ★ 4.1M refresh nightly
Developer tools were open source's first beachhead, and it shows: the editors, API clients, git forges, and CI runners below rival or beat their commercial counterparts — many are the forks that became standards of their own. What you gain by switching is not just the missing license fee. It is scriptability (most of these expose full APIs and CLI control), data portability (no vendor-format lock-in on your code review history or API collections), and transparency (you can read exactly what the tool does with your source code). Ranked by GitHub stars, with license and last-commit visible on every card — the two fastest signals for whether a tool is worth adopting.

All Developer Tools

OpenCode ★ 208K

AI coding agent for terminal, IDE, and desktop

rank001 licenseMIT written inTypeScript typeAI Assisted Coding
Langflow ★ 155K

Visual builder for AI agents and RAG pipelines

rank002 licenseMIT written inPython typeFrameworks & Platforms
Supabase ★ 110K

Postgres-powered backend platform for production apps

rank003 licenseApache-2.0 written inTypeScript typeFrameworks & Platforms
pi ★ 107K

Minimal terminal coding agent you can fully customize

rank004 licenseMIT written inTypeScript typeAI Assisted Coding
fastapi ★ 102K

FastAPI framework, high performance, easy to learn, fast to code, ready for production

rank005 licenseMIT written inPython typeAPI Development & Testing
Neovim ★ 102K

Hyperextensible, Lua-powered Vim-based text editor

rank006 licenseNOASSERTION written inVim Script typeIDEs & Code Editors
Zed ★ 90K

High-performance code editor built for speed and AI

rank007 licenseNOASSERTION written inRust typeIDEs & Code Editors
OpenHands ★ 88K

Autonomous coding agents that complete real engineering tasks

rank008 licenseMIT written inTypeScript typeAI Assisted Coding
vite ★ 83K

Next generation frontend tooling. It's fast!

rank009 licenseMIT written inTypeScript typeBuild & Deployment
Paperclip ★ 81K

Org chart, budgets, and governance for AI agent teams

rank010 licenseMIT written inTypeScript typeAI Assisted Coding
Hoppscotch ★ 80K

Sleek, intuitive API development and testing platform

rank011 licenseMIT written inTypeScript typeAPI Development & Testing
Orca ★ 71K

Run multiple AI coding agents in parallel, side by side

rank012 licenseMIT written inTypeScript typeAI Assisted Coding
Cline ★ 69K

Open-source AI coding agent for your editor and terminal

rank013 licenseApache-2.0 written inTypeScript typeAI Assisted Coding
webpack ★ 66K

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

rank014 licenseMIT written inJavaScript typeBuild & Deployment
Alacritty ★ 66K

High-performance terminal with GPU acceleration

rank015 licenseApache-2.0 written inRust typeTerminals
Warp ★ 65K

A modern terminal built around AI coding agents

rank016 licenseAGPL-3.0 written inRust typeTerminals
Ghostty ★ 61K

Fast GPU-accelerated terminal with native UI design

rank017 licenseMIT written inZig typeTerminals
PocketBase ★ 61K

Open-source backend in a single file

rank018 licenseMIT written inGo typeFrameworks & Platforms
Gitea ★ 58K

Self-hosted Git service for seamless collaboration

rank019 licenseMIT written inGo typeVersion Control & Collaboration
Appwrite ★ 57K

Open-source backend platform for rapid app development

rank020 licenseBSD-3-Clause written inPHP typeBuild & Deployment
Aider ★ 49K

AI pair programmer that works inside your terminal

rank021 licenseApache-2.0 written inPython typeAI Assisted Coding
Gogs ★ 48K

Self-hosted Git service that's lightweight and easy to install

rank022 licenseMIT written inGo typeVersion Control & Collaboration
Bruno ★ 47K

Lightweight, fast, and open-source API client for developers

rank023 licenseMIT written inJavaScript typeAPI Development & Testing
parcel ★ 44K

The zero configuration build tool for the web. 📦🚀

rank024 licenseMIT written inJavaScript typeBuild & Deployment
ToolJet ★ 41K

Build internal tools rapidly without coding

rank025 licenseAGPL-3.0 written inJavaScript typeFrameworks & Platforms
AppSmith ★ 41K

Empower your team to build custom internal tools rapidly

rank026 licenseApache-2.0 written inTypeScript typeFrameworks & Platforms
Insomnia ★ 40K

Powerful API development and testing made effortless

rank027 licenseApache-2.0 written inTypeScript typeAPI Development & Testing
TipTap ★ 38K

Craft rich text experiences with ease

rank028 licenseMIT written inTypeScript typeFrameworks & Platforms
Harness ★ 38K

End-to-end open source software delivery platform

rank029 licenseApache-2.0 written inGo typeBuild & Deployment
Directus ★ 38K

Open-source data platform for effortless content management

rank030 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
one-api ★ 37K

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

rank031 licenseMIT written inJavaScript typeAPI Development & Testing
Continue ★ 36K

Open-source coding agent for your IDE and terminal

rank032 licenseApache-2.0 written inTypeScript typeAI Assisted Coding
Zellij ★ 35K

Organize terminal sessions with built-in layouts, tabs, and panes

rank033 licenseMIT written inRust typeTerminals
Kitty ★ 35K

GPU-accelerated terminal built for power users

rank034 licenseGPL-3.0 written inPython typeTerminals
open-code-review ★ 34K

Fast, efficient, battle-tested at Alibaba's scale. Hybrid architecture code review tool: deterministic pipelines + LLM Agent, precise line-level comments, built

rank035 licenseApache-2.0 written inGo typeVersion Control & Collaboration
Tabby ★ 34K

AI-powered code completion for seamless development

rank036 licenseNOASSERTION written inRust typeAI Assisted Coding
Dokku ★ 32K

Self-hosted mini-PaaS for deploying applications easily

rank037 licenseMIT written inShell typeBuild & Deployment
code-review-graph ★ 32K

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

rank038 licenseMIT written inPython typeVersion Control & Collaboration
OpenAPI-Specification ★ 31K

The OpenAPI Specification Repository

rank039 licenseApache-2.0 written inMarkdown typeAPI Development & Testing
turborepo ★ 31K

Build system optimized for JavaScript and TypeScript, written in Rust

rank040 licenseMIT written inRust typeBuild & Deployment
nx ★ 29K

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

rank041 licenseMIT written inTypeScript typeBuild & Deployment
WezTerm ★ 29K

GPU-accelerated terminal emulator with multiplexing across all platforms

rank042 licenseNOASSERTION written inRust typeTerminals
Reflex ★ 29K

Full-stack Python platform for web apps and internal tools

rank043 licenseApache-2.0 written inPython typeVersion Control & Collaboration
Budibase ★ 28K

Build powerful web apps without complex coding

rank044 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
Kilo ★ 27K

AI coding agent for VS Code, JetBrains, CLI, and Cloud

rank045 licenseMIT written inTypeScript typeIDEs & Code Editors
Grok Build ★ 27K

AI coding agent and CLI for complex terminal workflows

rank046 licenseApache-2.0 written inRust typeAI Assisted Coding
Onlook ★ 27K

Visual React editor with real-time code updates

rank047 licenseApache-2.0 written inTypeScript typeFrameworks & Platforms
openapi-generator ★ 27K

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec

rank048 licenseApache-2.0 written inJava typeAPI Development & Testing
redoc ★ 26K

📘 OpenAPI/Swagger-generated API Reference Documentation

rank049 licenseMIT written inTypeScript typeAPI Development & Testing
GitLab ★ 25K

AI-powered DevSecOps for faster, secure software delivery

rank050 licenseNOASSERTION written inRuby typeVersion Control & Collaboration
NocoBase ★ 24K

Build custom apps without code, deploy with ease

rank051 licenseNOASSERTION written inTypeScript typeBuild & Deployment
CodeEdit ★ 23K

A native code editor for macOS

rank052 licenseMIT written inSwift typeIDEs & Code Editors
T3 Code ★ 23K

AI-powered coding made simple and efficient

rank053 licenseMIT written inTypeScript typeAI Assisted Coding
SafeLine ★ 23K

SafeLine is a self-hosted WAF(Web Application Firewall) / reverse proxy to protect your web apps from attacks and exploits.

rank054 licenseGPL-3.0 written inGo typeAPI Development & Testing
WaveTerm ★ 22K

Cross-platform terminal with AI built in

rank055 licenseApache-2.0 written inGo typeTerminals
Teable ★ 22K

Flexible database meets intuitive spreadsheet interface

rank056 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
Mobile-Security-Framework-MobSF ★ 22K

Mobile Security Framework (MobSF) is an automated, all-in-one mobile application (Android/iOS/Windows) pen-testing, malware analysis and security assessment fra

rank057 licenseGPL-3.0 written inJavaScript typeAPI Development & Testing
GitButler ★ 22K

Revolutionize your Git workflow with simultaneous branches

rank058 licenseNOASSERTION written inRust typeVersion Control & Collaboration
Dyad ★ 22K

Build unlimited AI apps locally with zero vendor lock-in

rank059 licenseNOASSERTION written inTypeScript typeAI Assisted Coding
WordPress ★ 21K

Create, customize, and manage your website with ease

rank060 licenseNOASSERTION written inPHP typeWebsite Builders
SWE-agent ★ 20K

AI agents that autonomously fix code and resolve GitHub issues

rank061 licenseMIT written inPython typeAI Assisted Coding
grpc-gateway ★ 20K

gRPC to JSON proxy generator following the gRPC HTTP spec

rank062 licenseBSD-3-Clause written inGo typeAPI Development & Testing
Yaak ★ 19K

Fast, secure, offline API client with Git integration

rank063 licenseMIT written inTypeScript typeAPI Development & Testing
hurl ★ 19K

Hurl, run and test HTTP requests with plain text.

rank064 licenseApache-2.0 written inRust typeAPI Development & Testing
gradle ★ 19K

Adaptable, fast automation for all

rank065 licenseApache-2.0 written inGroovy typeBuild & Deployment
iTerm 2 ★ 18K

Advanced terminal with modern features for Mac developers

rank066 licenseGPL-2.0 written inObjective-C typeTerminals
Paseo ★ 18K

Run coding agents from your phone, desktop, or terminal

rank067 licenseNOASSERTION written inTypeScript typeAI Assisted Coding
Apache APISIX ★ 17K

High-performance API gateway with built-in LLM support

rank068 licenseApache-2.0 written inLua typeAPI Development & Testing
Scalar ★ 16K

Open-source API documentation and testing platform

rank069 licenseMIT written inTypeScript typeAPI Development & Testing
Coder ★ 15K

Fast, secure cloud development environments on your infrastructure

rank070 licenseAGPL-3.0 written inGo typeVersion Control & Collaboration
Superset ★ 14K

Run dozens of AI coding agents in parallel on your machine

rank071 licenseNOASSERTION written inTypeScript typeAI Assisted Coding
gitpod ★ 14K

The developer platform for on-demand cloud development environments to create software faster and more securely.

rank072 licenseAGPL-3.0 written inTypeScript typeVersion Control & Collaboration
pr-agent ★ 13K

🚀 PR Agent: The Original Open-Source PR Reviewer. This project is not the Qodo free tier.

rank073 licenseMIT written inPython typeVersion Control & Collaboration
swag ★ 13K

Automatically generate RESTful API documentation with Swagger 2.0 for Go.

rank074 licenseMIT written inGo typeAPI Development & Testing
rspack ★ 13K

Fast Rust-based bundler for the web with a modernized webpack API 🦀

rank075 licenseMIT written inRust typeBuild & Deployment
Convex ★ 13K

Build full-stack apps with TypeScript and real-time sync

rank076 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
Encore ★ 12K

Accelerate backend development with effortless scalability

rank077 licenseMPL-2.0 written inGo typeVersion Control & Collaboration
devbox ★ 12K

Instant, easy, and predictable development environments

rank078 licenseApache-2.0 written inGo typeBuild & Deployment
xmake ★ 12K

🔥 A cross-platform build utility based on Lua

rank079 licenseApache-2.0 written inLua typeBuild & Deployment
Nango ★ 12K

Build product integrations with 500+ APIs in hours

rank080 licenseNOASSERTION written inTypeScript typeIntegration Platforms
fastapi_mcp ★ 12K

Expose your FastAPI endpoints as Model Context Protocol (MCP) tools, with Auth!

rank081 licenseMIT written inPython typeAPI Development & Testing
chalice ★ 11K

Python Serverless Microframework for AWS

rank082 licenseApache-2.0 written inPython typeBuild & Deployment
Alokai ★ 11K

Build and deploy scalable storefronts with ease

rank083 license written in typeFrameworks & Platforms
Tyk ★ 11K

Universal API management for REST, GraphQL, gRPC & async

rank084 licenseNOASSERTION written inGo typeAPI Development & Testing
wxt ★ 11K

⚡ Next-gen Web Extension Framework

rank085 licenseMIT written inTypeScript typeBuild & Deployment
Omnigent ★ 10K

Common layer for composing and governing AI agents

rank086 licenseApache-2.0 written inPython typeAI Assisted Coding
KeystoneJS ★ 10.0K

Flexible, scalable Node.js CMS and app framework

rank087 licenseMIT written inTypeScript typeFrameworks & Platforms
reviewdog ★ 9.6K

🐶 Automated code review tool integrated with any code analysis tools regardless of programming language

rank088 licenseMIT written inGo typeVersion Control & Collaboration
higress ★ 9.4K

🤖 AI Gateway | AI Native API Gateway

rank089 licenseApache-2.0 written inGo typeAPI Development & Testing
hunk ★ 9.3K

Review-first terminal diff viewer for agentic coders

rank090 licenseMIT written inTypeScript typeVersion Control & Collaboration
NHost ★ 9.3K

Serverless backend platform for modern app development

rank091 licenseMIT written inGo typeBuild & Deployment
django-ninja ★ 9.2K

💨 Fast, Async-ready, Openapi, type hints based framework for building APIs

rank092 licenseMIT written inPython typeAPI Development & Testing
api-platform ★ 9.2K

🕸️ Create REST and GraphQL APIs, scaffold Jamstack webapps, stream changes in real-time.

rank093 licenseMIT written inPHP typeAPI Development & Testing
HeyForm ★ 9.0K

Create powerful forms with ease and flexibility

rank094 licenseAGPL-3.0 written inTypeScript typeFrameworks & Platforms
WebStudio ★ 9.0K

Visual web development with code-level control

rank095 licenseAGPL-3.0 written inTypeScript typeWebsite Builders
karate ★ 9.0K

Test Automation Made Simple

rank096 licenseMIT written inJava typeAPI Development & Testing
shenyu ★ 8.8K

Apache ShenYu is a Java native API Gateway for service proxy, protocol conversion and API governance.

rank097 licenseApache-2.0 written inJava typeAPI Development & Testing
Builder ★ 8.8K

Visual development platform for modern web experiences

rank098 licenseMIT written inTypeScript typeWebsite Builders
plannotator ★ 8.7K

Annotate and review coding agent plans and code diffs visually, share with your team, send feedback to agents with one click.

rank099 licenseApache-2.0 written inTypeScript typeVersion Control & Collaboration
Ocelot ★ 8.7K

.NET API Gateway

rank100 licenseMIT written inC# typeAPI Development & Testing
litestar ★ 8.5K

Light, flexible and extensible ASGI framework | Built to scale

rank101 licenseMIT written inPython typeAPI Development & Testing
Vendure ★ 8.4K

Flexible e-commerce for modern businesses

rank102 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
Mockoon ★ 8.4K

Effortless API mocking for seamless development

rank103 licenseMIT written inTypeScript typeAPI Development & Testing
openapi-typescript ★ 8.4K

Generate TypeScript types from OpenAPI 3 specs

rank104 licenseMIT written inTypeScript typeAPI Development & Testing
superpowers-zh ★ 8.1K

🦸 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

rank105 licenseMIT written inJavaScript typeVersion Control & Collaboration
Fonoster ★ 8.1K

Open-source cloud communications platform for developers

rank106 licenseMIT written inTypeScript typeFrameworks & Platforms
xh ★ 8.1K

Friendly and fast tool for sending HTTP requests

rank107 licenseMIT written inRust typeAPI Development & Testing
Webiny ★ 8.0K

Open-source serverless CMS for modern web projects

rank108 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
kubevela ★ 7.9K

The Modern Application Platform.

rank109 licenseApache-2.0 written inGo typeBuild & Deployment
Woodpecker CI ★ 7.9K

Simple yet powerful CI/CD engine with great extensibility

rank110 licenseApache-2.0 written inGo typeBuild & Deployment
midway ★ 7.7K

🍔 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

rank111 licenseMIT written inTypeScript typeBuild & Deployment
go-git ★ 7.7K

A highly extensible Git implementation in pure Go.

rank112 licenseApache-2.0 written inGo typeVersion Control & Collaboration
DependencyCheck ★ 7.7K

OWASP dependency-check is a software composition analysis utility that detects publicly disclosed vulnerabilities in application dependencies.

rank113 licenseApache-2.0 written inJava typeBuild & Deployment
lightningcss ★ 7.7K

An extremely fast CSS parser, transformer, bundler, and minifier written in Rust.

rank114 licenseMPL-2.0 written inRust typeBuild & Deployment
Forgecode ★ 7.6K

Terminal-native AI coding agent built on ZSH

rank115 licenseApache-2.0 written inRust typeAI Assisted Coding
Tailcall ★ 7.6K

The modern GraphQL runtime

rank116 licenseApache-2.0 written inRust typeAPI Development & Testing
swagger-core ★ 7.5K

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

rank117 licenseApache-2.0 written inJava typeAPI Development & Testing
wiremock ★ 7.4K

A tool for mocking HTTP services

rank118 licenseApache-2.0 written inJava typeAPI Development & Testing
NSwag ★ 7.4K

The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.

rank119 licenseMIT written inC# typeAPI Development & Testing
DeepAudit ★ 7.0K

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。

rank120 licenseAGPL-3.0 written inPython typeVersion Control & Collaboration
Rowy ★ 6.8K

Build powerful backends without leaving your browser

rank121 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
gpt-load ★ 6.8K

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:

rank122 licenseMIT written inGo typeAPI Development & Testing
aws-sam-cli ★ 6.7K

CLI tool to build, test, debug, and deploy Serverless applications using AWS SAM

rank123 licenseApache-2.0 written inPython typeAPI Development & Testing
piku ★ 6.6K

The tiniest PaaS you've ever seen. Piku allows you to do git push deployments to your own servers.

rank124 licenseMIT written inPython typeBuild & Deployment
Bear ★ 6.5K

Generate compile_commands.json for any C or C++ build

rank125 licenseGPL-3.0 written inRust typeBuild & Deployment
RWKV-Runner ★ 6.5K

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

rank126 licenseMIT written inTypeScript typeAPI Development & Testing
Rivet ★ 6.1K

Build stateful backends with in-memory actors

rank127 licenseApache-2.0 written inRust typeBuild & Deployment
goa ★ 6.1K

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

rank128 licenseMIT written inGo typeAPI Development & Testing
cypress-realworld-app ★ 5.9K

A payment application to demonstrate real-world usage of Cypress testing methods, patterns, and workflows.

rank129 licenseMIT written inTypeScript typeAPI Development & Testing
typia ★ 5.9K

Super-fast/easy runtime validators and serializers via transformation

rank130 licenseMIT written inGo typeAPI Development & Testing
easegress ★ 5.9K

A Cloud Native traffic orchestration system. (CNCF Project)

rank131 licenseApache-2.0 written inGo typeAPI Development & Testing
open-connector ★ 5.8K

Open-source auth gateway connecting 1500+ SaaS providers to AI agents through SDK, CLI, MCP, HTTP, and OpenAPI.

rank132 licenseApache-2.0 written inTypeScript typeAPI Development & Testing
Emdash ★ 5.8K

Dashboard for running multiple coding agents in parallel

rank133 licenseApache-2.0 written inTypeScript typeAI Assisted Coding
kgateway ★ 5.7K

The Cloud-Native API Gateway and AI Gateway

rank134 licenseApache-2.0 written inGo typeAPI Development & Testing
notion-sdk-js ★ 5.7K

Official Notion JavaScript Client

rank135 licenseMIT written inTypeScript typeAPI Development & Testing
orpc ★ 5.6K

Typesafe APIs Made Simple 🪄

rank136 licenseMIT written inTypeScript typeAPI Development & Testing
farm ★ 5.6K

Extremely fast Vite-compatible web build tool written in Rust

rank137 licenseMIT written inRust typeBuild & Deployment
hey-api ★ 5.4K

👨‍🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode,

rank138 licenseMIT written inTypeScript typeAPI Development & Testing
tsuru ★ 5.3K

Open source and extensible Platform as a Service (PaaS).

rank139 licenseBSD-3-Clause written inGo typeBuild & Deployment
serverless-express ★ 5.3K

Run Express and other Node.js frameworks on AWS Serverless technologies such as Lambda, API Gateway, Lambda@Edge, and more.

rank140 licenseApache-2.0 written inJavaScript typeAPI Development & Testing
extension.js ★ 5.2K

The cross-browser extension framework.

rank141 licenseMIT written inTypeScript typeBuild & Deployment
tau ★ 5.1K

Fullstack Workspace for Humans & Machines

rank142 licenseBSD-3-Clause written inGo typeBuild & Deployment
go-restful ★ 5.1K

package for building REST-style Web Services using Go

rank143 licenseMIT written inGo typeAPI Development & Testing
Jitsu ★ 5.1K

Open-source data integration for modern stacks

rank144 licenseMIT written inTypeScript typeIntegration Platforms
modern.js ★ 5.0K

A progressive web framework based on React and Rsbuild.

rank145 licenseMIT written inTypeScript typeBuild & Deployment
mockserver-monorepo ★ 5.0K

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,

rank146 licenseApache-2.0 written inJava typeAPI Development & Testing
sbt ★ 5.0K

sbt, the interactive build tool

rank147 licenseApache-2.0 written inScala typeBuild & Deployment
spring-cloud-gateway ★ 4.9K

An API Gateway built on Spring Framework and Spring Boot providing routing and more.

rank148 licenseApache-2.0 written inJava typeAPI Development & Testing
agentgateway ★ 4.9K

Next Generation Agentic Proxy for AI Agents and MCP servers

rank149 licenseApache-2.0 written inRust typeAPI Development & Testing
ACI.dev ★ 4.9K

Build reliable AI agents with unified tool integration

rank150 licenseApache-2.0 written inPython typeIntegration Platforms
style-dictionary ★ 4.8K

A build system for creating cross-platform styles.

rank151 licenseApache-2.0 written inJavaScript typeBuild & Deployment
autorest ★ 4.8K

OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, PowerShell, Go, Java, Node.js, TypeScript, Python

rank152 licenseMIT written inTypeSpec typeAPI Development & Testing
Integuru ★ 4.8K

The first AI agent that builds permissionless integrations through reverse engineering platforms' internal APIs.

rank153 licenseAGPL-3.0 written inPython typeAPI Development & Testing
/dev/push ★ 4.7K

Deploy apps instantly with git push - open source alternative

rank154 licenseMIT written inPython typeBuild & Deployment
emissary ★ 4.5K

open source Kubernetes-native API gateway for microservices built on the Envoy Proxy

rank155 licenseApache-2.0 written inPython typeAPI Development & Testing
mcp-context-forge ★ 4.5K

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

rank156 licenseApache-2.0 written inPython typeAPI Development & Testing
trunk ★ 4.4K

Build, bundle & ship your Rust WASM application to the web.

rank157 licenseApache-2.0 written inRust typeBuild & Deployment
optillm ★ 4.3K

Optimizing inference proxy for LLMs

rank158 licenseApache-2.0 written inPython typeAPI Development & Testing
cake ★ 4.2K

:cake: Cake (C# Make) is a cross platform build automation system.

rank159 licenseMIT written inC# typeBuild & Deployment
retire.js ★ 4.2K

scanner detecting the use of JavaScript libraries with known vulnerabilities. Can also generate an SBOM of the libraries it finds.

rank160 licenseApache-2.0 written inJavaScript typeBuild & Deployment
Chartbrew ★ 4.1K

Create stunning data visualizations with ease

rank161 licenseNOASSERTION written inJavaScript typeFrameworks & Platforms
octelium ★ 4.1K

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

rank162 licenseAGPL-3.0 written inGo typeAPI Development & Testing
HTTPie ★ 4.0K

Modern command-line HTTP client for the API era

rank163 licenseNOASSERTION written in typeAPI Development & Testing
middy ★ 3.9K

🛵 The stylish Node.js middleware engine for AWS Lambda 🛵

rank164 licenseMIT written inJavaScript typeBuild & Deployment
claudia ★ 3.9K

Deploy Node.js projects to AWS Lambda and API Gateway easily

rank165 licenseMIT written inJavaScript typeAPI Development & Testing
pants ★ 3.8K

The Pants Build System

rank166 licenseApache-2.0 written inPython typeBuild & Deployment
nba_api ★ 3.8K

An API Client package to access the APIs for NBA.com

rank167 licenseMIT written inPython typeAPI Development & Testing
Bknd ★ 3.8K

Feature-rich backend that runs anywhere you need it

rank168 licenseApache-2.0 written inTypeScript typeFrameworks & Platforms
ATAC ★ 3.7K

A simple API client (postman like) in your terminal

rank169 licenseMIT written inRust typeAPI Development & Testing
curlie ★ 3.7K

The power of curl, the ease of use of httpie.

rank170 licenseMIT written inGo typeAPI Development & Testing
OpnForm ★ 3.7K

Create powerful forms with ease and flexibility

rank171 licenseNOASSERTION written inPHP typeFrameworks & Platforms
Zappa ★ 3.7K

Serverless Python

rank172 licenseMIT written inPython typeAPI Development & Testing
kubernetes-client ★ 3.7K

Java client for Kubernetes & OpenShift

rank173 licenseApache-2.0 written inJava typeAPI Development & Testing
proguard ★ 3.7K

ProGuard, Java optimizer and obfuscator

rank174 licenseGPL-2.0 written inJava typeBuild & Deployment
schemathesis ★ 3.6K

Catch API bugs before your users do

rank175 licenseMIT written inPython typeAPI Development & Testing
rsbuild ★ 3.4K

Fast, extensible build tool for modern web development

rank176 licenseMIT written inTypeScript typeBuild & Deployment
php-curl-class ★ 3.3K

PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs

rank177 licenseUnlicense written inPHP typeAPI Development & Testing
run-aspnetcore-microservices ★ 3.3K

Microservices on .NET platforms used ASP.NET Web API, Docker, RabbitMQ, MassTransit, Grpc, Yarp API Gateway, PostgreSQL, Redis, SQLite, SqlServer, Marten, Entit

rank178 licenseMIT written inC# typeAPI Development & Testing
ruby-openai ★ 3.2K

OpenAI API + Ruby! 🤖❤️ GPT-5 & Realtime WebRTC compatible!

rank179 licenseMIT written inRuby typeAPI Development & Testing
tuicr ★ 3.1K

a code review TUI with vim keybindings

rank180 licenseMIT written inRust typeVersion Control & Collaboration
cc-gateway ★ 3.0K

AI API identity gateway — reverse proxy that normalizes device fingerprints and telemetry for privacy-preserving API proxying

rank181 licenseMIT written inTypeScript typeAPI Development & Testing
gateway ★ 3.0K

Manages Envoy Proxy as a Standalone or Kubernetes-based Application Gateway

rank182 licenseApache-2.0 written inGo typeAPI Development & Testing
WindsurfAPI ★ 3.0K

Turn Windsurf / Devin Desktop's 100+ AI models (Claude, GPT, Gemini, DeepSeek, Kimi, GLM, SWE) into OpenAI-, Anthropic- & Gemini-compatible APIs. Zero-dependenc

rank183 licenseMIT written inJavaScript typeAPI Development & Testing
Silex ★ 3.0K

Free, open-source visual website builder for designers

rank184 licenseAGPL-3.0 written inTypeScript typeWebsite Builders
cargo-make ★ 3.0K

Rust task runner and build tool.

rank185 licenseApache-2.0 written inRust typeBuild & Deployment
apidash ★ 2.9K

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

rank186 licenseApache-2.0 written inDart typeAPI Development & Testing
mill ★ 2.8K

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

rank187 licenseMIT written inScala typeBuild & Deployment
Restfox ★ 2.8K

Offline-First Minimalistic HTTP & Socket Testing Client for the Web & Desktop

rank188 licenseMIT written inVue typeAPI Development & Testing
Krakend ★ 2.7K

Blazing-fast API gateway with linear scalability

rank189 licenseApache-2.0 written inGo typeAPI Development & Testing
please ★ 2.6K

High-performance extensible build system for reproducible multi-language builds.

rank190 licenseApache-2.0 written inGo typeBuild & Deployment
Firecamp ★ 2.6K

Unified API development ecosystem for modern teams

rank191 licenseAGPL-3.0 written inTypeScript typeAPI Development & Testing
nodejsscan ★ 2.6K

nodejsscan is a static security code scanner for Node.js applications.

rank192 licenseGPL-3.0 written inCSS typeVersion Control & Collaboration
scons ★ 2.4K

SCons - a software construction tool

rank193 licenseMIT written inPython typeBuild & Deployment
Frappe Builder ★ 2.4K

Visual website builder for effortless web design

rank194 licenseMIT written inPython typeWebsite Builders
1backend ★ 2.3K

Build AI (or any) apps with scalable microservices & microfrontends.

rank195 licenseAGPL-3.0 written inGo typeBuild & Deployment
cargo-crev ★ 2.3K

A cryptographically verifiable code review system for the cargo (Rust) package manager.

rank196 licenseApache-2.0 written inRust typeVersion Control & Collaboration
kiro-gateway ★ 2.3K

👻 Proxy API gateway for Kiro IDE & CLI (Amazon Q Developer / AWS CodeWhisperer). Use free Claude models with any client.

rank197 licenseAGPL-3.0 written inPython typeAPI Development & Testing
penguin-harness ★ 2.3K

🐧 Harness for RSI. Let AI Build AI. Multi-Agent Auto-Dev Platform. Everything is Transparent.

rank198 licenseApache-2.0 written inTypeScript typeBuild & Deployment
api-umbrella ★ 2.2K

Open source API management platform

rank199 licenseMIT written inRuby typeAPI Development & Testing
notion-sdk-py ★ 2.2K

Notion API client SDK, rewritten in Python! (sync + async)

rank200 licenseMIT written inPython typeAPI Development & Testing
microcks ★ 2.0K

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

rank201 licenseApache-2.0 written inJava typeAPI Development & Testing
resterm ★ 1.9K

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

rank202 licenseApache-2.0 written inGo typeAPI Development & Testing
AngusTester ★ 1.8K

AI-native software testing platform — one YAML test language covering API, Web, mobile, messaging, data, and LLM scenarios. Self-hostable.

rank203 licenseGPL-3.0 written in typeAPI Development & Testing
Serverless-Devs ★ 1.8K

:fire: Serverless Devs: Serverless developer tool ( Serverless Devs: Serverless 开发者工具 )

rank204 licenseApache-2.0 written inTypeScript typeBuild & Deployment
Synara ★ 1.8K

Code with Claude, Codex, Gemini, and more in one workspace

rank205 licenseMIT written inTypeScript typeAI Assisted Coding
pythagora ★ 1.8K

Generate automated tests for your Node.js app via LLMs without developers having to write a single line of code.

rank206 licenseApache-2.0 written inJavaScript typeAPI Development & Testing
Voiden ★ 1.8K

Build APIs like code with Git-native workspace

rank207 licenseApache-2.0 written inTypeScript typeAPI Development & Testing
paasta ★ 1.7K

An open, distributed platform as a service

rank208 licenseApache-2.0 written inPython typeBuild & Deployment
reviewboard ★ 1.7K

An extensible and friendly code review tool for projects and companies of all sizes.

rank209 licenseMIT written inPython typeVersion Control & Collaboration
WireMock.Net ★ 1.7K

WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java,

rank210 licenseApache-2.0 written inC# typeAPI Development & Testing
Semaphore ★ 1.6K

Open source CI/CD platform that's faster and costs less

rank211 licenseNOASSERTION written inElixir typeBuild & Deployment
mantis ★ 1.6K

A modular, stack-agnostic toolkit of security review skills for AI coding agents to autonomously find, reproduce, and patch vulnerabilities.

rank212 licenseApache-2.0 written inPython typeVersion Control & Collaboration
Kodus ★ 1.4K

AI code review that learns your team's standards

rank213 licenseNOASSERTION written inTypeScript typeAI Assisted Coding
DPP ★ 1.4K

C++ Discord API Bot Library - D++ is Lightweight and scalable for small and huge bots!

rank214 licenseApache-2.0 written inC++ typeAPI Development & Testing
algoliasearch-client-javascript ★ 1.4K

⚡️ A fully-featured and blazing-fast JavaScript API client to interact with Algolia.

rank215 licenseMIT written inTypeScript typeAPI Development & Testing
smocker ★ 1.3K

Smocker is a simple and efficient HTTP mock server and proxy

rank216 licenseMIT written inTypeScript typeAPI Development & Testing
Jean ★ 1.3K

Parallel AI agent workspaces with Git and project context

rank217 licenseApache-2.0 written inTypeScript typeAI Assisted Coding
WunderGraph ★ 1.3K

Unify APIs, databases, and services effortlessly

rank218 licenseApache-2.0 written inTypeScript typeAPI Development & Testing
Hexabot ★ 1.2K

Self-hosted AI agents and workflows across any channel

rank219 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
php-vcr ★ 1.2K

Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.

rank220 licenseMIT written inPHP typeAPI Development & Testing
Pullfrog ★ 1.2K

AI agent workflows built natively into GitHub

rank221 licenseMIT written inTypeScript typeAI Assisted Coding
Vvveb CMS ★ 1.2K

Open source CMS with powerful drag-and-drop builder

rank222 licenseAGPL-3.0 written inHTML typeWebsite Builders
autoprompt-skill ★ 1.2K

Autoprompt is a coding-agent skill that cuts failures by 45% on agentic coding tasks.

rank223 licenseMIT written inJavaScript typeVersion Control & Collaboration
cloud-in-a-bottle ★ 1.2K

Deploy, use, and share web apps on a server you control. Your apps, data, and infrastructure stay yours.

rank224 licenseAGPL-3.0 written inPython typeBuild & Deployment
Hercules ★ 1.2K

Open-source testing agent for UI, API, security, accessibility & visual QA

rank225 licenseAGPL-3.0 written inPython typeTesting & Quality Assurance
ProcessWire ★ 1.2K

Flexible CMS for developers, powerful for clients

rank226 licenseNOASSERTION written inPHP typeFrameworks & Platforms
crit ★ 1.1K

Your feedback loop with the agent

rank227 licenseMIT written inGo typeVersion Control & Collaboration
LyteNyte Grid ★ 1.0K

Lightning-fast React data grid for enterprise scale

rank228 licenseNOASSERTION written inTypeScript typeFrameworks & Platforms
agentsys ★ 986

AI writes code. This automates everything else · 24 plugins · 49 agents · 44 skills · for Claude Code, OpenCode, Codex, Cursor, Kiro.

rank229 licenseMIT written inJavaScript typeVersion Control & Collaboration
sandboxd ★ 944

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

rank230 licenseMIT written inGo typeBuild & Deployment
macai ★ 931

All-in-one native macOS AI chat application for virtually any AI provider

rank231 licenseApache-2.0 written inSwift typeAPI Development & Testing
aimock ★ 930

Mock everything your AI app talks to — LLM APIs, MCP, A2A, AG-UI, vector DBs, search. One package, one port, zero dependencies.

rank232 licenseMIT written inTypeScript typeAPI Development & Testing
binance ★ 926

Node.js & JavaScript SDK for Binance REST APIs & WebSockets, with TypeScript & browser support, integration tests, beautification & more.

rank233 licenseMIT written inTypeScript typeAPI Development & Testing
swiftwave ★ 893

Self-hosted lightweight PaaS solution to deploy and manage your applications on any VPS [Your own self-hosted Heroku, Vercel]

rank234 licenseApache-2.0 written inGo typeBuild & Deployment
mockttp ★ 883

Powerful friendly HTTP mock server & proxy library

rank235 licenseApache-2.0 written inTypeScript typeAPI Development & Testing
apitest ★ 846

A simple and extensible behavioural testing library for Go. You can use api test to simplify REST API, HTTP handler and e2e tests.

rank236 licenseMIT written inGo typeAPI Development & Testing
GitComet ★ 845

Fast, local-first Git GUI built in Rust

rank237 licenseAGPL-3.0 written inRust typeVersion Control & Collaboration
dev-proxy ★ 831

Simulate API failures, throttling, and chaos — all from your command line.

rank238 licenseMIT written inC# typeAPI Development & Testing
Structr ★ 830

Build complete web apps with integrated graph database

rank239 licenseNOASSERTION written inJava typeFrameworks & Platforms
just-api ★ 814

:boom: Test REST, GraphQL APIs

rank240 licenseMIT written inJavaScript typeAPI Development & Testing
Linky ★ 799

A delightfully rich and dynamic link-in-bio.

rank241 licenseMIT written inTypeScript typeWebsite Builders
claudie ★ 793

Cloud-agnostic managed Kubernetes

rank242 licenseApache-2.0 written inGo typeBuild & Deployment
davmail ★ 758

DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at

rank243 licenseGPL-2.0 written inJava typeVersion Control & Collaboration
cell ★ 746

Cell is a Serverless First, componentized, platform-independent progressive application framework based on TypeScript. Cell 是基于 TypeScript 的 Serverless First、组件

rank244 licenseMIT written inTypeScript typeBuild & Deployment
greenmail ★ 744

Official master for the Greenmail project

rank245 licenseApache-2.0 written inJava typeAPI Development & Testing
cuber-gem ★ 713

An open-source automation tool that simplifies the deployment of your apps on Kubernetes.

rank246 licenseApache-2.0 written inRuby typeBuild & Deployment
Frontman ★ 698

AI coding agent that sees your live app and edits code

rank247 licenseNOASSERTION written inReScript typeAI Assisted Coding
portman ★ 685

Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽‍🚀

rank248 licenseApache-2.0 written inTypeScript typeAPI Development & Testing
zeabur ★ 681

A platform that helps you deploy services with one click.

rank249 licenseMPL-2.0 written inHTML typeBuild & Deployment
backend.ai ★ 669

Backend.AI is a streamlined, container-based computing cluster platform that hosts popular computing/ML frameworks and diverse programming languages, with plugg

rank250 licenseLGPL-3.0 written inPython typeBuild & Deployment
httpmock ★ 667

HTTP mocking library for Rust

rank251 licenseMIT written inRust typeAPI Development & Testing
runn ★ 649

runn is a package/tool for running operations following a scenario.

rank252 licenseMIT written inGo typeAPI Development & Testing
Argos ★ 627

Visual regression testing for seamless UI development

rank253 licenseMIT written inTypeScript typeTesting & Quality Assurance
pactum ★ 620

REST API Testing Tool for all levels in a Test Pyramid

rank254 licenseMIT written inJavaScript typeAPI Development & Testing
serenity-js ★ 616

A TypeScript-native acceptance testing framework that gives your Playwright Test, WebdriverIO, or Cucumber test suite the architecture it needs to scale.

rank255 licenseApache-2.0 written inTypeScript typeAPI Development & Testing
epinio ★ 606

Opinionated platform that runs on Kubernetes, that takes you from App to URL in one step.

rank256 licenseApache-2.0 written inGo typeBuild & Deployment
Giselle ★ 557

Build and deploy AI agents through visual workflows

rank257 licenseApache-2.0 written inTypeScript typeFrameworks & Platforms
git.limo ★ 515

A Git source code management tool powered by Elixir with easy installation & high extensibility.

rank258 licenseMIT written inElixir typeVersion Control & Collaboration
mocker-api ★ 500

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.

rank259 licenseMIT written inTypeScript typeAPI Development & Testing
Nordcraft ★ 489

Craft AAA web apps that delight your users

rank260 licenseApache-2.0 written inTypeScript typeWebsite Builders
Hive ★ 483

Open-source GraphQL federation platform

rank261 licenseMIT written inTypeScript typeAPI Development & Testing
Gravitee ★ 456

Unified API, event, and AI agent management platform

rank262 licenseApache-2.0 written inJava typeAPI Development & Testing
Shelve ★ 456

Simplify project management for developers

rank263 licenseApache-2.0 written inTypeScript typeVersion Control & Collaboration
Convertigo ★ 385

Low-code and no-code platform for business apps

rank264 licenseNOASSERTION written inJava typeIntegration Platforms
Orbital ★ 360

Connect APIs, databases, and streams without glue code

rank265 licenseNOASSERTION written inTypeScript typeIntegration Platforms
Ycode ★ 308

Visual website builder and CMS you can self-host

rank266 licenseMIT written inTypeScript typeWebsite Builders
Stormkit ★ 260

Deploy web apps with automated CI/CD and full infrastructure control

rank267 licenseNOASSERTION written inGo typeBuild & Deployment
Roomote ★ 244

Self-hosted AI coding agent that opens real PRs

rank268 licenseNOASSERTION written inTypeScript typeAI Assisted Coding
Capgo ★ 206

OTA updates for Capacitor apps without app store delays

rank269 licenseAGPL-3.0 written inTypeScript typeBuild & Deployment
Palform ★ 45

Secure, encrypted forms with advanced features

rank270 licenseAGPL-3.0 written inRust typeFrameworks & Platforms
Proxed AI ★ 8

Secure AI API management for iOS apps with DeviceCheck

rank271 licenseAGPL-3.0 written inTypeScript typeFrameworks & Platforms
Forgejo ★ 0

Self-hosted Git forge that's lightweight and secure

rank272 license written in typeVersion Control & Collaboration

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.