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

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

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

📘 OpenAPI/Swagger-generated API Reference Documentation

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

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

Swagger Editor

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

Generate Go client and server boilerplate from OpenAPI 3 specifications

Generate TypeScript types from OpenAPI 3 specs

Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.

Knife4j is a set of Swagger2 and OpenAPI3 All-in-one enhancement solution

Language-agnostic HTTP API Testing Tool

Browser extension that generates API specs for any app or website

🌐 Wikipedia for Web APIs. Directory of REST API definitions in OpenAPI 2.0/3.x format

Library for OpenAPI 3 with spring-boot

OpenAPI based HTTP Client code generator