Best API Gateways & Backends GitHub Repositories

A collective list of free APIs

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

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

LocalAI is the open-source AI engine. Run any model - LLMs, vision, voice, image, video - on any hardware. No GPU required.

A unified trading API with more than 100 crypto exchanges and prediction markets in JavaScript / TypeScript / Python / C# / PHP / Go / Java / Rust

🧙‍♀️ Move Fast and Break Nothing. End-to-end typesafe APIs made easy.

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

An open-source engine that turns continuous content streams into search and monitoring. Durable ingestion, hybrid search, alerts, and plugins for formats, models and business rules.

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Automate browser based workflows with AI

lightweight, idiomatic and composable router for building Go HTTP services

The industry standard for API mocking in JavaScript.

Turn any website into a structured API. Extract, automate, search and monitor the web.

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

API Support for your favorite torrent trackers

An API documentation generator for JavaScript.

A developer-friendly API for converting many document formats into PDF files, and more!

Offline documentation browser. Your personal reference library, searchable in an instant.

List of Permanent Free LLM API (API Keys)

Open-source search database for full-text, vector, and hybrid search with real-time indexing and SQL.