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

Bruno is a new and innovative API client, aimed at revolutionizing the status quo represented by Postman and similar tools out there.

Apache APISIX is a dynamic, real-time, high-performance API Gateway.

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

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

Redoc is an open source tool for generating documentation from OpenAPI (formerly Swagger) definitions.

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

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