321 Meet lets you share your screen, or their screen, online, with online chat. They don’t indicate any limitation on the number of people who can participate. There isn’t any audio, though.
I don’t think it’s ready to be added to The Best Online Tools For Real-Time Collaboration, but let me know if I’m wrong.
I believe the audio is something that they’re currently working at right now and I was inferred that this feature will be made available for paid versions.
321Meet is impressive and very simplistic although its still in beta right now but I think its a product that is intriguing.