Content Management Sistem che ti posso consigliare:
Drupal http://www.drupal.org
Geeklog http://www.geekloag.net
phpWCMS http://www.phpwcms.de
phpWebSite http://phpwebsite.appstate.edu/
Siteframe http://siteframe.org/
Xoops http://www.xoops.org/