VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Web based system for Computer Assisted Telephone Interviewing (CATI)
Open source Fax server software for inbound / outbound internet Faxing
The most affordable CRM system according to Capterra
Enterprise telephony recording and retrieval system
H.323 Gatekeeper for VoIP and videconferencing
Cress is a comprehensive toolset for graphical service/workflow design
Simple web interface for mapping CDR from VoIP provider to Asterisk
JAvascript Voicexml InterpretER
Cyber-wrt pbx is embedded system in DD-Wrt router
A suite of open-source tools and frameworks for creating SIP apps