VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
VICIdial Contact Center Suite
The most affordable CRM system according to Capterra
Web based system for Computer Assisted Telephone Interviewing (CATI)
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.
Cyber-wrt pbx is embedded system in DD-Wrt router
GNU Telephony Services and Applications
Graph active VoIP calls on Google Maps.