Matrix reference homeserver
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
VICIdial call center optimization tools, monitoring utilities, and per
ICTCore: Unified Communications Framework for web developers
Unified Communications Server
Unified Communications System - PBX System
High performance, production quality STUN server and client library
Kazoo Live Medium. From Null to a Full Featured PBX on minutes
Accent interfaces and controls systems through goals and policies
H.323 Gatekeeper for VoIP and videconferencing
SIP Video Multiconference Media Server with WebRTC support.
CMS API Server with web site
SIPURA brand ATA to ncidd gateway
A Murmur-Server Webinterface written in PHP for Mumble
Universal Framework to audit Voip protocols's security