Wiggio was a free service that allowed users to create groups, host virtual meetings and conference calls, manage events, create to-do lists, poll members, send messages, and upload and manage folders. You could connect with your Facebook account or create a new and free account with Wiggio. They are no longer supporting previously available Wiggio apps.

Skype allows free voice and video computer-to-computer calls, and calls to phone numbers for a fee. Video is only available for person-to-person calls, but multiple users can join a voice call. Skype can be used for free by educators in the classroom: http://www.educatorstechnology.com/2012/06/complete-guide-to-use-of-skyp...

ECHODamp is a multi-channel audio mixer and echo controller designed primarily for the High-Bandwidth Musical Video-teleconference environment and is meant for audio-engineers and musicians to share high quality audio in video-teleconferencing.