Course Management Software

I'm really interested in the use of online courses developed with Blackboard, Moodle or similar packages, aka Learning Management Systems (LMS) or Virtual Learning Environments (VLE). The problem is that I have never had a first-hand experience with any of them. I know that some institutions make use of these systems, but I have not found a single one of them freely accessible. If anyone out there can share some info on the subject or, better still, allow me to sneak into a biblical studies or theology class, I would really appreciate it. Thanks!