A content management system manages content. Normally on a WebSite. In a way, this Wiki is a ContentManagementSystem.
An excellent list of open-source CMS systems can be found at http://www.la-grange.net/cms, http://www.opensourcecms.com, and http://www.xmeta.com/content_management/open_source/
5 pages link to ContentManagementSystem: