TCPDF : TCPDF is a FLOSS PHP class for generating PDF documents.
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.