Typo3

TYPO3 is a free available open source content management system, tailored to the needs of companies for Internet, intranet, and extranet. TYPO3 offers features and modules, as well as an expansion port for maximum versatility.
What is content management?
A content management system (CMS) is a software that helps to create Web sites, to manage and to manage all relevant to the World Wide Web publication formats.
Some basic features you find in the most content management systems:
separation of content, structure and Design
The Division of the three basic components of any Web site brings key advantages during the life cycle of a Web site - and even beyond.
First, the design is created, expanded or relaunches, without that then the content should be extracted and reinserted - arrange design and content of alone.Simple content ProduktionIn of graphical user interface (or the alternative front end editing function) authors can write text, insert images, and multimedia data, temporally controlling content and much more, and as a dynamic website build and maintain.
This is even easier with the server-side graphics generation in TYPO3 e.g. for automated generating navigation elements, graphical image headings etc.

taken from Typo3