e107

e107 is a content management system written in php and using the popular open source mySQL database system for content storage. It's completely free and totally customisable, and in constant development.

Homepage: http://www.e107.org/
Disk Space: 7.8 MB
Documentation: http://docs.e107.org/
Support Forum: http://e107.org/e107_plugins/forum/forum.php
License: GPL