Natural Docs - Natural Docs is an open-source documentation generator for multiple programming languages.
Doxygen - Generate documentation from source code
Eclipse with JSDT - The Eclipse Foundation - home to a global community, the Eclipse IDE, Jakarta EE and over 350 open source projects, including runtimes, tools and frameworks.
DocFX - A documentation generation tool for API reference and Markdown files!
PyDoctor - Pydoctor was created to replace Epydoc for more improvement. An API documentation generator that works by static analysis.
swagger.io - Swagger is an open source RESTapi Documentation Tool.