Videostream - The easiest way to stream video from your computer to Chromecast or AndroidTV.
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
AirWire - AirWire is a highly advanced application that enables its users to connect to their smartphone or any tablet device to a network, select any file and start playing any multimedia file.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
AllCast - AllCast is a mobile application that allows you to send photos, videos and music on your phone to your TV.
tSIP - tomeko.net/software: SIP client for Windows.