The best alternative is Doxygen, which is both free and Open Source. Other great apps like swagger.io are Slate API Docs Generator, ReDoc, Magidoc and Apiary.
Although the terms once referred to the same thing, they can no longer be used interchangeably…even though some people still do. In 2021, OpenAPI refers to the industry-standard specification for RESTful API design. Swagger refers to a set of SmartBear tools.
Swagger is an API specification & Postman is an API Client and appropriate for API first development while, Postman is appropriate for testing such API based on specifications.
Yes, there are a few of them.
ReDoc [Article on swagger.io] [GitHub] [demo] - Reinvented OpenAPI/Swagger-generated API Reference Documentation (I'm the author)
OpenAPI GUI [GitHub] [demo] - GUI / visual editor for creating and editing OpenApi / Swagger definitions (has OpenAPI 3 support)
Responsive Fork of SwaggerUI [GitHub] [demo]
SwaggerUI-Angular [GitHub] [demo] - An angularJS implementation of Swagger UI
angular-swagger-ui-material [GitHub] [demo] - Material Design template for angular-swager-ui
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