Issabel PBX - Unified Communications
A WebRTC-Enabled Chrome Extension for Seamless Call Center
ICTCore: Unified Communications Framework for web developers
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)
Web interface for OpenSIPS
C++ SIP stack based on Chrome source code