OpenMeetings: I dunno where you are seeing no releases this year, the last release was in May. Yes it is still beta, but it's core functionality is quite stable, and it is under active developement. There is a vmware appliance already if you want to see it in action. If it is too early keep an eye on it then, I think this will be a popular project in the future as there are few open source alternatives.
I rechecked the releases, you are right. I will test openmeetings if it fits in our system.