VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
VICIdial Contact Center Suite
Web based system for Computer Assisted Telephone Interviewing (CATI)
The most affordable CRM system according to Capterra
Unified Communications Server
Enterprise telephony recording and retrieval system
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.