Moodle - Open-source learning platform | Moodle.org

Drupal ( /ˈdruːpəl/) is a free and open-source content management system (CMS) and content management framework (CMF) written in PHP and distributed under the GNU General Public License.^[2][3][4] It is used as a back-end system for at least 1.5% of all websites worldwide^[5][6] ranging from personal blogs to corporate, political, and government sites including whitehouse.gov and data.gov.uk.^[7] It is also used for knowledge management and business collaboration.