A domain based multi-tenant PBX & voice switch for FreeSWITCH
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
VICIdial Contact Center Suite
Web based system for Computer Assisted Telephone Interviewing (CATI)
Cellular manager for mobile phones/modems
Open source Fax server software for inbound / outbound internet Faxing
The most affordable CRM system according to Capterra
Unified Communications Server
Enterprise telephony recording and retrieval system
H.323 Gatekeeper for VoIP and videconferencing
Cress is a comprehensive toolset for graphical service/workflow design
Java VoIP/SIP PBX system (replaced by jfPBX)
An administration web interface for Mumble VoIP servers in PHP
Simple web interface for mapping CDR from VoIP provider to Asterisk