Unified Communications System - PBX System
Java VoIP Softphone (SIP) (replaced by jfPhone)
High performance, production quality STUN server and client library
H.323 Gatekeeper for VoIP and videconferencing
Microscopic AGI framework.
Webface witch extract CDR (Call Detail Records) from MySQL base.
VozBox. Asterisk VoIP PBX.
Baresip is a modular SIP User-Agent with audio and video support
Optimized and cross platform SMPTE 2022 FEC library in C, Python, Java
Respins of various open source PBX projects
C++ SIP stack based on Chrome source code