The most affordable CRM system according to Capterra
Unified Communications Server
Unified Communications System - PBX System
Asterisk based VoIP pbx appliance
VozBox. Asterisk VoIP PBX.
vTiger Freeswitch PBX Integration
Cyber-wrt pbx is embedded system in DD-Wrt router
predictive dialing for vTiger using asterisk
CRM system based on vtiger, adapted to Polish companies.