"5: Joomla!
Yet another content management system that is as flexible as any other and widely used around the globe. The user list of Joomla! includes the United Nations, MTV Quizilla, LA Weekly, IHOP, University of Harvard, Citibank intranet, The Green Maven, and Outdoor Photographer. Joomla! is as simple to install as Drupal, includes numerous modules, and has a large community (which publishes a regular community magazine). A number of published books cover using Joomla! to build sites, creating extensions (modules) for it, beginning Joomla!, and Joomla! training, among other topics. Why would you choose Joomla! over Drupal? There are a number of possible reasons: If you need a shopping cart, if you want to include an event calendar, if you want a large selection of templates, if you want to include document management, or if you need commercial support.
"6: MediaWiki
MediaWiki was originally created for Wikipedia but is now used for many other *wikis. MediaWiki is intended to be run on server farms for sites that receive millions of hits per day. It’s powerful and quite scalable. The backbone of MediaWiki is PHP and MySQL. The list of sites using MediaWiki is extensive. What MediaWiki has over many other Wiki servers is the ability to include multimedia files (including images, audio, and video). MediaWiki also has a large collection of extensions from AimButton to YouTubeTag (and many in between)."
