Moodle is a Course Management System (CMS), also known as a Learning Management System (LMS) or a Virtual Learning Environment (VLE). It is a Free web application that educators can use to create effective online learning sites. It is used by over 54,000 institutions (that we know about) and millions of teachers in 212 countries.

via SourceForge Community Blog | Project of the Month, July 2011.

What is the difference between Course Management and Content Management?  I suspect very little.