The UK's Open University is now providing some free open access online course materials using Moodle. But the system is not without some problems. Each time I log in I have difficulty finding my way back to the courses I have enrolled in (which are at "My Learning Space"). If I try to change any of the details recorded about me I get "Incorrect sesskey submitted, form not accepted!".
While a free unviersity course sounds like a bargan, these are only short courses (3 to 18 hours) and all self paced. That is you are presented with a few pages of notes to read, some exercises to do and then told to record it in your journal. There is no tutor to help you and no assessment.