Plone

Plone is built on top of the open source application server Zope and the accompanying Content Management Framework which has thousands of developers around the world supporting it. Plone is ideal as an intranet and extranet server, as a document publishing system and as a groupware tool for collaboration between separately located entities. A versatile software product like Plone can be used in a myriad of ways.

The link address is: http://www.plone.org/