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Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Slack - A messaging app for teams who see through the Earth!
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
ShortPoint - Design beautiful intranets for your company without code
tSIP - tomeko.net/software: SIP client for Windows.
Vvvv - vvvv is a graphical programming environment for easy prototyping and development.