Krysalis
Krysalis: "Transform XML documents into XHTML with PHP and XSL
For a web applications programmer who has to develop complex enterprise level applications, web services or multi language dynamic websites (Content Management Systems), Krysalis is a development platform that improves the Apache/PHP framework by separating the application logic from the presentation layer, using open standards as XML/XSL/SOAP. Unlike any other application servers and frameworks, our platform is an open source solution for productive web development."