ApiGen : ApiGen is the tool for creating professional API documentation from PHP source code, similar to discontinued phpDocumentor/phpDoc.
StyleDocco : StyleDocco generates documentation and style guide documents from your stylesheets.
Swagger : Swagger is a powerful open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs...
phpDocumentor enables you to generate documentation from your PHP source code. This documentation provides an in-depth view of your project to you, your consumers and contributors.