Moodle is a fully-featured, highly flexible open source Learning Platform (also known as a Learning Management System or a Virtual Learning Environment).

Currently used in more than 230 countries with more than 70 million users worldwide, Moodle was first developed in 2001 by Martin Dougiamas based on the idea of providing teachers with the tools to create sequences of powerful activities to engage students in active collaborative learning.

Supported by a global network of certified Moodle Partners, Moodle HQ continues to work with developers and educators worldwide to support a fast growing community of Moodle users.

For more about Moodle and to download it for free, see http://moodle.org