Best Open Source api Libraries
A curated list of the most popular GitHub repositories tagged with api. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.
#1public-apis/public-apis
A collective list of free APIs
#2neovim/neovim
Vim-fork focused on extensibility and usability
#3fastapi/fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production
#4hoppscotch/hoppscotch
Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia
#5typicode/json-server
Get a full fake REST API with zero coding in less than 30 seconds (seriously)
#6ocornut/imgui
Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
#7strapi/strapi
🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.
#8meilisearch/meilisearch
A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.
#9mudler/LocalAI
:robot: The free, Open Source alternative to OpenAI, Claude and others. Self-hosted and local-first. Drop-in replacement, running on consumer-grade hardware. No GPU required. Runs gguf, transformers, diffusers and many more. Features: Generate Text, MCP, Audio, Video, Images, Voice Cloning, Distributed, P2P and decentralized inference
#10ccxt/ccxt
A cryptocurrency trading API with more than 100 exchanges in JavaScript / TypeScript / Python / C# / PHP / Go
#11trpc/trpc
🧙♀️ Move Fast and Break Nothing. End-to-end typesafe APIs made easy.
#12QuivrHQ/quivr
Opiniated RAG for integrating GenAI in your apps 🧠 Focus on your product rather than the RAG. Easy integration in existing products with customisation! Any LLM: GPT4, Groq, Llama. Any Vectorstore: PGVector, Faiss. Any Files. Anyway you want.
#13Kong/insomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.
#14httpie/cli
🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.
#15chatanywhere/GPT_API_free
Free ChatGPT&DeepSeek API Key，免费ChatGPT&DeepSeek API。免费接入DeepSeek API和GPT4 API，支持 gpt | deepseek | claude | gemini | grok 等排名靠前的常用大模型。
#16directus/directus
The flexible backend for all your projects 🐰 Turn your DB into a headless CMS, admin panels, or apps with a custom UI, instant APIs, auth & more.
#17hasura/graphql-engine
Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.
#18songquanpeng/one-api
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 Docker 镜像，一键部署，开箱即用。LLM API management & key redistribution system, unifying multiple providers under a single API. Single binary, Docker-ready, with an English UI.
#19encode/django-rest-framework
Web APIs for Django. 🎸
#20YMFE/yapi
YApi 是一个可本地部署的、打通前后端及QA的、可视化的接口管理平台
#21littlecodersh/ItChat
A complete and graceful API for Wechat. 微信个人号接口、微信机器人及命令行微信，三十行即可自定义个人号机器人。
#22PostgREST/postgrest
REST API for any Postgres database
#23OpenAPITools/openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
#24pppscn/SmsForwarder
短信转发器——监控Android手机短信、来电、APP通知，并根据指定规则转发到其他手机：钉钉群自定义机器人、钉钉企业内机器人、企业微信群机器人、飞书机器人、企业微信应用消息、邮箱、bark、webhook、Telegram机器人、Server酱、PushPlus、手机短信等。包括主动控制服务端与客户端，让你轻松远程发短信、查短信、查通话、查话簿、查电量等。（V3.0 新增）PS.这个APK主要是学习与自用，如有BUG请提ISSUE，同时欢迎大家提PR指正
#25Skyvern-AI/skyvern
Automate browser based workflows with AI
#26bitwarden/server
Bitwarden infrastructure/backend (API, database, Docker, etc).
#27mswjs/msw
Industry standard API mocking for JavaScript.
#28Evil0ctal/Douyin_TikTok_Download_API
🚀「Douyin_TikTok_Download_API」是一个开箱即用的高性能异步抖音、快手、TikTok、Bilibili数据爬取工具，支持API调用，在线批量解析及下载。
#29apache/apisix
The Cloud-Native API Gateway and AI Gateway
#30amplication/amplication
Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows that drive consistency, enable high-quality code practices, simplify onboarding, and accelerate standardized delivery across teams.
#31fangzesheng/free-api
收集免费的接口服务,做一个api的搬运工
#32jsdoc/jsdoc
An API documentation generator for JavaScript.
#33apitable/apitable
🚀🎉📚 APITable, an API-oriented low-code platform for building collaborative apps and better than all other Airtable open-source alternatives.
#34getmaxun/maxun
🔥 The open-source no-code platform for web scraping, crawling, search and AI data extraction • Turn websites into structured APIs in minutes 🔥
#35iii-hq/iii
iii (pronounced “three eye”) unifies your existing backend stack with a single engine and three primitives: Function, Worker, and Trigger.
#36Jackett/Jackett
API Support for your favorite torrent trackers
#37BrainJS/brain.js
🤖 GPU accelerated Neural networks in JavaScript for Browsers and Node.js
#38gotify/server
A simple server for sending and receiving messages in real-time per WebSocket. (Includes a sleek web-ui)
#39star7th/showdoc
ShowDoc is a tool greatly applicable for an IT team to share documents online一个非常适合IT团队的在线API文档、技术文档工具
#40ruby-grape/grape
An opinionated framework for creating REST-like APIs in Ruby.
#41astrit/css.gg
700+ Pure CSS, SVG & Figma UI Icons, 6000+ glyphs, patterns, colors and layouts.
#42go-swagger/go-swagger
Swagger 2.0 implementation for go
#43falconry/falcon
The no-magic web API and microservices framework for Python developers, with a focus on reliability and performance at scale.
#44lihengming/spring-boot-api-project-seed
:seedling::rocket:一个基于Spring Boot & MyBatis的种子项目，用于快速构建中小型API、RESTful API项目~
#45hiteshchoudhary/apihub
Your own API Hub to learn and master API interaction. Ideal for frontend, mobile dev and backend developers.
#46httpie/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
#47yagop/node-telegram-bot-api
Telegram Bot API for NodeJS
#48api-platform/api-platform
🕸️ Create REST and GraphQL APIs, scaffold Jamstack webapps, stream changes in real-time.
#49coaidev/coai
🚀 Next Generation Multi-tenant AI One-Stop Solution. Builtin Admin & Billing System. Enterprise-Grade Unified LLM Gateway Support for 200+ Models And 35+ Providers, Load Balacing w/ Priority-base Routing, Cost Management, Chat Share, Cloud Sync, Credit/Subscription Billing, All File Parsing, Web Search, Built-in Model Cache.
#50artilleryio/artillery
The complete load testing platform. Everything you need for production-grade load tests. Serverless & distributed. Load test with Playwright. Load test HTTP APIs, GraphQL, WebSocket, and more. Use any Node.js module.