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Aegir CMS LGPL

Ariadne GNU GPL

Bitflux GNU General Public License (GPL)

Callisto GPL (General Public License)

CocoBlog Apache Software License, 1.1

DBPrism CMS Apache Software License

elevateIT GPL

eZ publish GPL

jLibrary BSD License

Kontentor GPL (GNU Public License)

LifeCMS GPL

Mambo GNU/GPL License

MySource Apache License

Nuxeo CPS GPL

OpenCms GNU Lesser General Public License (LGPL)
phpCMS GNU General Public License (GPL)

phpSlash GNU General Public License (GPL)

Postnuke GNU General Public License (GPL)

Silva BSD

Tiki GNU LGPL License

webEditor ???

XIMS Perl Artistic License/GPL

Apache Lenya Apache Software License

Back-End GPL

Bricolage BSD License

Campsite GNU General Public License

Cofax Cofax Software License (based on apache)
Drupal GNU General Public License

eNvolution GPL

Jahia CMS and Portal Server Jahia Collaborative Open Source License
Komplete Lite GPL

Krang BSD

Magnolia LGPL

MMBase Mozilla Public License

Nukes LGPL

OmegaCMS BSD-style License

OS Reviews CMS GNU General Public License (GPL)
PHP-Nuke GNU General Public License (GPL)

Plone GNU General Public License (GPL)

Red Hat CCM CCM resp. IBM Public License

Syntax CMS Common Public License

Typo3 GPL

WebGUI GNU GPL

XOOPS GNU GPL

Zeit CMS GPL