Moodle is an open-source learning management system used by over 150 countries that was designed to foster online learning communities. It follows social constructivist pedagogy and has over 150,000 registered users on its website. Schools like the Open University in the UK, UCLA, and Smith College now use Moodle to deliver courses online to their students. Moodle is provided freely as open-source software under the GNU Public License and includes many features to support online learning like forums, quizzes, assignments and more.