Matrix reference homeserver
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Open source Fax server software for inbound / outbound internet Faxing
VICIdial call center optimization tools, monitoring utilities, and per
ICTCore: Unified Communications Framework for web developers
Unified Communications Server
Accent interfaces and controls systems through goals and policies
SIP Video Multiconference Media Server with WebRTC support.
CMS API Server with web site
Cyber-wrt pbx is embedded system in DD-Wrt router
perl based SMDR/CDR capture & display on Web based PHP with mysql DB
OpenSource Call Center and Dialer System
A Murmur-Server Webinterface written in PHP for Mumble
A suite of open-source tools and frameworks for creating SIP apps