Check out Plone, an open-source, community-supported Content Management System built on top of Zope. A dozen national governments use Plone as their institutional CMS. A good corporate example is Novell; most of Novell's web presence runs on Plone instead of the CMS they own and sell. Plone is built to cluster and scale, and it's basic operations are rock solid. Plone is a top-level framework that runs on top of Zope. Zope is a web app server, so Plone runs Zope apps as plug-ins. There may be a hundred (at least scores) of community-developed modules. Plone has more to offer than Drupal, Joomla, or Alfresco, some of the leading open-source CMSs, but there is a lot more to learn. Plone is easy to set up and its basic functions are easy to manage, but if you add a lot of functionality Plone gets complicated. Joomla, Drupal and Alfresco are relatively simpler and have different look and feel. They may have what you need, and you may prefer their simplicity/look/feel. You can check out reviews of other CMSs at: http://cmsreview.net/ http://www.cmsreview.com/ http://www.cmswatch.com/ My favorite Plone resource sites: http://www.plone.org/ http://planet.plone.org/ http://plope.com/ http://www.zope.org/ http://www.zopezen.org/ http://www.zopelabs.com/