Starting with VLE's
Virtual Learning Environments (VLEs) or vClassrooms
Learning Times: http://www.learningtimes.org
Tapped In: http://tappedin.org/tappedin
Vyew: http://vyew. com/site/
WiZiQ: http://www.wiziq.com (no longer free)
I could review each one - but, I leave that to you.
enjoy! next up will be their tools for working with video.