X3 CMS - Simple and Powerful PHP based Content Management System
X3 CMS is an user friendly CMS. It is W3C compliant, that is each page is xHTML and CSS 2 is used for layout. It is build over an MVC framework derived from Kohana. It is modular and its functionality could be extended via plugin. Its features include Users and Group management, Files management, Page caching, Search engine support, Multiple language support, WYSISYG editor, SEO friendly URL and lot more.
It uses database abstraction to interact with database, so it could ideally work with any database. By default it uses MySQL.