Flexible, Extensible And XSLT Powered Open Source CMS : Symphony

Symphony is a XSLT Powered web-based content management system (CMS) that enables users to create and manage websites and web applications of all shapes and sizes—from the simplest of blogs to bustling news sites and feature-packed social networks.

Symphony is engineered to be immanently flexible. It allows you to define the types of content you’ll manage, the structures that will deliver that content to the front end, and the templates that will transform it into various formats for your users.