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Drupal
Drupal is a free and opensource web content management system (CMS) written in PHP and distributed under the GNU General Public License.Drupal provides an opensource backend framework for at least 14% of the top 10,000 websites worldwide and 1.2% of the top 10 million websitesranging from personal blogs to corporate, political, and government sites.Systems also use Drupal for knowledge management and for business collaboration.
