Java wrapper for the popular chat & VOIP service
Issabel PBX - Unified Communications
Free, native Windows SIP softphone with HD audio, SRTP encryption
ICTCore: Unified Communications Framework for web developers
A WebRTC-Enabled Chrome Extension for Seamless Call Center
Java VoIP Softphone (SIP) (replaced by jfPhone)
High performance, production quality STUN server and client library
Asterisk based VoIP pbx appliance
Accent interfaces and controls systems through goals and policies
H.323 Gatekeeper for VoIP and videconferencing
SIP Video Multiconference Media Server with WebRTC support.
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
The OZEKI VoIP Service Checker allows you to check VoIP services.
Web interface for OpenSIPS