A representational state transfer (REST) API is a way to provide compatibility between computer systems on the internet. The concept was first outlined in a dissertation by Roy Fielding in 2000.
Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia
🔥 🔥 🔥 A Free & Self-hostable Airtable Alternative
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
⚡️ Express inspired web framework written in Go
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.
🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.
Send push notifications to your phone or desktop using PUT/POST
A cloud-native Go microservices framework with cli tool for productivity.
Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.
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)
lightweight, idiomatic and composable router for building Go HTTP services
Parse Server for Node.js / Express
An opinionated GoLang framework for accelerated microservice development. Built in support for databases and observability.
🚀 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. 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。
gRPC to JSON proxy generator following the gRPC HTTP spec
swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.
Scalar is an open-source API platform: 🌐 Modern REST API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
A curated list of free public APIs — searchable, community-maintained, with a free JSON API.
Created by Roy Fielding
Released 2000