Moodle is a Course Management System (CMS).
http://moodle.org/
Content Management System · Learning Management System
Get access to data on 93,167 websites that are Moodle Customers. We know of 56,592 live websites using Moodle and an additional 36,575 sites that used Moodle historically and 20,908 websites in the United States.
Get a list of 93,167 websites using Moodle which includes location information, hosting data, contact details, 56,592 currently live websites and an additional 42,004 domains that redirect to sites in this list. 36,575 sites that used this technology previously and 20,908 websites in the United States currently using Moodle.