Unified Communications System - PBX System
Java VoIP Softphone (SIP) (replaced by jfPhone)
CMS API Server with web site
Open source streamlined SIP client built on Linphone
Baresip is a modular SIP User-Agent with audio and video support
Application to make JAD files
Optimized and cross platform SMPTE 2022 FEC library in C, Python, Java
The OZEKI VoIP Service Checker allows you to check VoIP services.
Client VoIP for Windows Mobile
C++ SIP stack based on Chrome source code