Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Parsec - Streams games locally or over the internet
tSIP - tomeko.net/software: SIP client for Windows.
Moonlight-Stream.org - Moonlight allows you to stream your collection of games from your GameStream-compatible PC to any...
YakYak - Desktop client for Google Hangouts
Shadow - Transform any device into a supercharged gaming machine.