VICIdial Contact Center Suite
Web based system for Computer Assisted Telephone Interviewing (CATI)
The most affordable CRM system according to Capterra
Unified Communications Server
H.323 Gatekeeper for VoIP and videconferencing
Linux GUI USSD Sender
Webface witch extract CDR (Call Detail Records) from MySQL base.
GNU Telephony Services and Applications
Cyber-wrt pbx is embedded system in DD-Wrt router
Graph active VoIP calls on Google Maps.
A suite of open-source tools and frameworks for creating SIP apps
CRM system based on vtiger, adapted to Polish companies.