The most affordable CRM system according to Capterra
Unified Communications System - PBX System
Project about FusionPBX on Live Medium
Proximus Forum 700 pbx dial number management
Kazoo Live Medium. From Null to a Full Featured PBX on minutes
Cyber-wrt pbx is embedded system in DD-Wrt router
CRM system based on vtiger, adapted to Polish companies.
Extend vTiger CRM to add FreeSWITCH support