Java wrapper for the popular chat & VOIP service
Java VoIP Softphone (SIP) (replaced by jfPhone)
Accent interfaces and controls systems through goals and policies
SIP Video Multiconference Media Server with WebRTC support.
Java VoIP/SIP PBX system (replaced by jfPBX)
Positional Audio Communication for Minecraft with Mumble
The OZEKI VoIP Service Checker allows you to check VoIP services.
C++ SIP stack based on Chrome source code