List of free API-documentation stuff for developerππ½
If you're looking for all programming tools around API-documentation (not just free). Check this page List of API-documentation Programming Tools

3 personal projects 1 project collaborator 1 team Unlimited team members 1 team project

Open Source Free updates forever API Client Design APIs Plugins Community Support (Github and Slack)

Swagger
Simplify API development for users, teams, and enterprises with the Swagger open source and professional toolset. Find out how Swagger can help you design and document your APIs at scale.
Tag: API, API-documentation
1 User API Editor, Hosted Docs & Mocking