specifications in YAML inside your browser and to preview documentations in real time. Swagger UI: Swagger UI is a collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation from an OAS- compliant API. Swagger Codegen: Allows generation of API client libraries (SDK generation), server stubs and documentation automatically given an OpenAPI Spec. Swagger Parser: Standalone library for parsing OpenAPI definitions from Java Swagger Core: Java-related libraries for creating, consuming, and working with OpenAPI definitions Swagger Inspector (free): API testing tool that lets you validate your APIs & generate OpenAPI definitions from an existing API SwaggerHub (free and commercial): API design and documentation, built for teams working with OpenAPI. SmartBear (Inspector, Hub )Open Source