Drupal

Drupal is an open source social publishing platform that empowers individuals, teams, and communities to easily publish, manage and organize a wide variety of content on a website. Tens of thousands of people and organizations have used Drupal to power scores of different web sites, including community web portals, corporate web sites, social networking sites, personal web sites or blogs, and much more.

Drupal is ready to go from the moment you download it. The built-in functionality, combined with dozens of freely available add-on modules, will enable features such as content management, blogs, wiki collaborative authoring, tagging, picture galleries and much more.