Drupal /ˈdruːpəl/ is a free and open-source content-management framework written in PHP and distributed under the GNU General Public License.It is used as a back-end framework for at least 2.1% of all Web sites worldwide ranging from personal blogs to corporate, political, and government sites.he Drupal community comprises more than one million members (as of October 2013) and 31,000 Developers (as of February 2014). The Drupal Overview, a feature of the project web site, describes it as a content management framework.