swagger.io is described as 'Swagger is an open source RESTapi Documentation Tool' and is a documentation generator in the development category. There are more than 25 alternatives to swagger.io for a variety of platforms, including Web-based, Mac, Linux, Windows and SaaS apps. The best swagger.io alternative is Doxygen, which is both free and Open Source. Other great apps like swagger.io are Slate API Docs Generator, Treblle, Redocly and ArdorQuery.
Free browser-based OpenAPI editor from Postman. Design or import a Swagger 2.0, OpenAPI 3.0, or OpenAPI 3.1 spec (YAML or JSON) and see live documentation with inline validation as you type. No signup, no install. Part of Postman's suite of free developer tools at postman.
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