Thanks for that feedback. Searching about Angel reveals it's been purchased (as others have) by Blackboard. The past behavior of BB suggests this may not upgrade BB as much as it may just reduce the competition.
Where is the Linux of courseware?
Moodle is OSS. Why not get involved and contribute there?
Right. If anything is the "Linux of courseware" it's Moodle.
Personally, though, I think the whole concept of a "course management system" goes away in time.