Moodle is a Course Management System (CMS).
http://moodle.org/
Content Management System · Learning Management System
Get access to data on 89,475 websites that are Moodle Customers. We know of 50,127 live websites using Moodle and an additional 39,348 sites that used Moodle historically and 18,898 websites in the United States.
Get a list of 89,475 websites using Moodle which includes location information, hosting data, contact details, 50,127 currently live websites and an additional 41,077 domains that redirect to sites in this list. 39,348 sites that used this technology previously and 18,898 websites in the United States currently using Moodle.