A collective list of free APIs
- api
- public-apis
- free
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Repository Index
47,133 repositories indexed
1–24 of 1,062 · Most stars
User-friendly AI Interface (Supports Ollama, OpenAI API, ...)
FastAPI framework, high performance, easy to learn, fast to code, ready for production
- python
- json
- swagger-ui
- redoc
Vim-fork focused on extensibility and usability
Gin is a high-performance HTTP web framework written in Go. It provides a Martini-like API but with significantly better performance—up to 40 times faster—thanks to httprouter. Gin is designed for building REST APIs, web applications, and microservices.
- server
- middleware
- framework
- go
Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia
- api
- api-client
- api-rest
- pwa
Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Library, proxy, MCP server.
Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
Get a full fake REST API with zero coding in less than 30 seconds (seriously)
🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.
The Cloud Native Application Proxy
🔥 🔥 🔥 A Free & Self-hostable Airtable Alternative
- automatic-api
- airtable
- no-code
- no-code-database
A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.
- search-engine
- typo-tolerance
- site-search
- database
LocalAI is the open-source AI engine. Run any model - LLMs, vision, voice, image, video - on any hardware. No GPU required.
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
- api-client
- git
- graphql-client
- opensource
Enhanced ChatGPT Clone: Features Agents, MCP, Skills, DeepSeek, Anthropic, AWS, OpenAI, Responses API, Azure, Groq, o1, GPT-5, Mistral, OpenRouter, Vertex AI, Gemini, Artifacts, AI model switching, message search, Code Interpreter, langchain, DALL-E-3, OpenAPI Actions, Functions, Secure Multi-User Auth, Presets, open-source for self-hosting. Active
Full-stack web application template with FastAPI, React, SQLModel, PostgreSQL, Vite, Tailwind CSS, shadcn/ui, FastAPI Cloud, and Docker Compose.
- python
- docker
- postgresql
- fastapi
Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation
- payments
- rust
- orchestration
- hacktoberfest
免费大模型API，支持免费调用GPT、DeepSeek等主流模型，免费额度10000点，每日刷新！另付费价格最低官方1-2折！
A unified trading API with more than 100 crypto exchanges and prediction markets in JavaScript / TypeScript / Python / C# / PHP / Go / Java / Rust
🦍 The API and AI Gateway
- api-gateway
- microservices
- api-management
- serverless
🧙♀️ Move Fast and Break Nothing. End-to-end typesafe APIs made easy.
⚡️ Express inspired web framework written in Go
- go
- golang
- fiber
- web
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.