Work by Drupal

Drupal

Drupal (pronounced /druːpəl/) is a free and open source content management system (CMS) written in PHP and distributed under the GNU General Public License. It is claimed to be used as a back-end system for at least 1% of all websites worldwide, ranging from small personal blogs to large corporate and political sites, including whitehouse.gov and data.gov.uk. It is also used for knowledge management and business collaboration.

http://www.drupal.org