Open Source Cms

Ez Community
Ez publish is an open source content management system, providing web content management solutions for intranets, e-commerce and digital media publishing.
http://ez.no/community

Mmbase
Mmbase
http://www.mmbase.nl/

Opencms
Opencms
http://www.opencms.org/

Rodin
Rodin
http://rodin.lot23.com/