Java wrapper for the popular chat & VOIP service
Desktop communication tool: chat, telephony, multimedia
A beautiful SMS messenger for Android
Java VoIP Softphone (SIP) (replaced by jfPhone)
Accent interfaces and controls systems through goals and policies
Enterprise telephony recording and retrieval system
SIP Video Multiconference Media Server with WebRTC support.
Cress is a comprehensive toolset for graphical service/workflow design
Java VoIP/SIP PBX system (replaced by jfPBX)
Positional Audio Communication for Minecraft with Mumble
Universal Framework to audit Voip protocols's security
ss7mon an SS7/SIGTRAN signalling monitor
Send Asterisk CDR to serial device
The OZEKI VoIP Service Checker allows you to check VoIP services.