#WebRTC - free and open source truly simple #video #chat and screen sharing for small groups can replace #Skype
No more email invitations – simply share the link to the room you have created with the people you want to talk to and voilà! The protocol is already built into all modern browsers so no installs either.
Enterprises could setup their own internal signalling server (it is #FOSS) after all.
Try out either #Talky http://talky.io or http://appear.in