Free Lypp Service
Lypp is a new calling service that uses IM and command line commands to create one-to-one calls and group calls. By sending a simple command from AIM, MSN, Yahoo, Jabber, Gtalk, or ICQ like "call 6045551212, 7035551212", users can create a quick group call. It will be launching in September. It will be Free.
WebRTC.is 