TYPO3 is a free Open Source content management system for enterprise purposes
on the web and in intranets. It offers full flexibility and extendability while
featuring an accomplished set of ready-made interfaces, functions and modules.

The current stable LTS release (for new and existing projects)
The latest version with Long Term Support (LTS). It will get full support until
March 2017.

WWW: http://typo3.org/