Tiki Wiki CMS Groupware is a free and open source Wiki-based content management system and online office suite written primarily in PHP and distributed under the GNU Lesser General Public License (LGPL) license.

free ware open source CMS software with XML Sapiens, file flat, WYSIWYG, RSS and web services development tool (for news publishing, gallery, survey, ecommerce and etc)

TYPO3 is an enterprise-class, Open Source CMS (Content Management System), used internationally to build and manage websites of all types, from small sites for non-profits to multilingual enterprise solutions for large corporations.

SPIP est un système de publication pour l’Internet qui s’attache particulièrement au fonctionnement collectif, au multilinguisme et à la facilité d’emploi. C’est un logiciel libre, distribué sous la licence GNU/GPL. Il peut ainsi être utilisé pour tout site Internet, qu’il soit associatif ou institutionnel, personnel ou marchand.

Plone is a free and open source content management system built on top of the Zope application server.

CMSimple is a content management system (CMS), which requires no database. All data are stored in 2 files, content.htm (content) and pagedata.php (page-related data).