REST API

Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

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

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

Sample ASP.NET Core 8.0 reference application, now community supported: https://github.com/NimblePros/eShopOnWeb

swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.

Low code web framework for real world applications, in Python and Javascript

Apache Camel is an open source integration framework with 350+ connectors. Write routes in Java, YAML, or XML. Run on Spring Boot, Quarkus, or standalone. Apache License 2.0.

🔥 🔥 🔥 A Free & Self-hostable Airtable Alternative

Parse Server for Node.js / Express

A cloud-native Go microservices framework with cli tool for productivity.

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.

Open source GPS tracking platform - self-hosted or managed, 200+ device protocols

CakePHP: The Rapid Development Framework for PHP - Official Repository

Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

lightweight, idiomatic and composable router for building Go HTTP services

🚀 抖音、TikTok 数据采集与无水印视频下载 API，自托管，支持 MCP 调用与 Docker 一键部署。| Self-hosted TikTok & Douyin scraper and no-watermark video downloader — async REST API, MCP server, CLI and web console for posts, profiles, comments and playlists. Self-healing identity pool, PostgreSQL archive, one docker compose up.

Microsoft REST API Guidelines

The goal of this tutorial is to guide you through the coding of a full-stack JavaScript example application project and connecting a backend API to an Angular 5 front-end application employing the MEAN stack.

gRPC to JSON proxy generator following the gRPC HTTP spec