Matrix reference homeserver
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Open source Fax server software for inbound / outbound internet Faxing
ICTCore: Unified Communications Framework for web developers
Unified Communications Server
High performance, production quality STUN server and client library
Accent interfaces and controls systems through goals and policies
SIP Video Multiconference Media Server with WebRTC support.
CMS API Server with web site
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