Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
CThruView Transparent Image Viewer - CThruView is a free transparent image viewer that allows mouse clicks to go through the image.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
PixelPerfect - Allows developers to put a semi-transparent image overlay over the top of the developed HTML and...
tSIP - tomeko.net/software: SIP client for Windows.
Osiva - Osiva" is an acronym that stands for "Overly Simple Image Viewing