This document provides a list of 31 API documentation solutions, with each listing including the name of the solution, a brief description, and a link. The solutions cover a range of formats including OpenAPI/Swagger, API Blueprint, RAML, and others. They provide functionality such as visualization of API resources, generation of documentation from code or specifications, and interactive developer portals. The list is compiled by Bill Doerrfeld and sourced from Apis.guru.