The most affordable CRM system according to Capterra
High performance, production quality STUN server and client library
Enterprise telephony recording and retrieval system
H.323 Gatekeeper for VoIP and videconferencing
Cress is a comprehensive toolset for graphical service/workflow design
Java VoIP/SIP PBX system (replaced by jfPBX)
Universal Framework to audit Voip protocols's security
Send Asterisk CDR to serial device
CRM system based on vtiger, adapted to Polish companies.
Web interface for OpenSIPS