Open source Fax server software for inbound / outbound internet Faxing
The most affordable CRM system according to Capterra
High performance, production quality STUN server and client library
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)
A complete invoice managment solution for Elastix PBX
1 on 1 Webcam Videochat Script with P2P Support
Baresip is a modular SIP User-Agent with audio and video support
CRM system based on vtiger, adapted to Polish companies.
Web interface for OpenSIPS