Moodle is a Course Management System (CMS).
http://moodle.org/
Content Management System · Learning Management System
Get access to data on 85,044 websites that are Moodle Customers. We know of 51,410 live websites using Moodle and an additional 33,634 sites that used Moodle historically and 19,455 websites in the United States.
Get a list of 85,044 websites using Moodle which includes location information, hosting data, contact details, 91,192 currently live websites which includes 39,782 domains that redirect to sites in the list. 33,634 sites that used this technology previously and 19,455 websites in the United States currently using Moodle.