Symphony: XSLT content management system
Symphony [1] is an open source content management system designed to let developers program exclusively in the XSLT templating language.
The philosophy behind Symphony is that nothing should be sacrificed for flexibility – developers should have full control over their website’s markup, URLs and data structures.
Symphony is written in PHP5 (don’t mix it up with Symfony PHP Framework) is released under MIT/X11 License. You are also able to clone the project from GitHub.