Java wrapper for the popular chat & VOIP service
Issabel PBX - Unified Communications
Java VoIP Softphone (SIP) (replaced by jfPhone)
High performance, production quality STUN server and client library
Accent interfaces and controls systems through goals and policies
H.323 Gatekeeper for VoIP and videconferencing
Java VoIP/SIP PBX system (replaced by jfPBX)
Positional Audio Communication for Minecraft with Mumble
Universal Framework to audit Voip protocols's security
Send Asterisk CDR to serial device
Web interface for OpenSIPS
C++ SIP stack based on Chrome source code