OpenCMS
Opencms from alkacon software, easy to use, professional open source content management / cms based on java and xml
http://www.opencms.org/
MMbase
MMbase
http://www.mmbase.nl/
Joomla
Joomla! - content management system and web application framework
http://www.joomla.org/
EZ community
Ez publish is an open source content management system (cms) and an open source content management framework (cmf).
http://ez.no/community
OpenIMS
Openims enterprise content management (cms) en document management (dms) server
http://www.openims.com/
OpensourceCMS.com
Open source cms demo, try before you ... install
http://www.opensourcecms.com/
Plainback
Plainback
http://www.plainblack.com/
PHPnuke
The future of the web
http://phpnuke.org/
OScommerce
OScommerce
http://www.oscommerce.com/
Rodin
Rodin
http://rodin.lot23.com/