Moodle is a Course Management System (CMS).
http://moodle.org/
Content Management System · Learning Management System
Get access to data on 104,259 websites that are Moodle Customers. We know of 56,867 live websites using Moodle and an additional 47,392 sites that used Moodle historically and 21,000 websites in the United States.
Get a list of 104,259 websites using Moodle which includes location information, hosting data, contact details, 56,867 currently live websites and an additional 49,193 domains that redirect to sites in this list. 47,392 sites that used this technology previously and 21,000 websites in the United States currently using Moodle.