Matrix reference homeserver
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Open source auto dialer for voice, fax and SMS campaigns
VICIdial call center optimization tools, monitoring utilities, and per
Open source Fax server software for inbound / outbound internet Faxing
Unified communications framework and REST API for developers
Issabel PBX - Unified Communications
Unified Communications Server
Unified Communications System - PBX System
Accent interfaces and controls systems through goals and policies
http://www.vaakpbx.com
H.323 Gatekeeper for VoIP and videconferencing
SIP Video Multiconference Media Server with WebRTC support.
A command line utility for remote controlling Polycom VVX IP phones
Simple web interface for mapping CDR from VoIP provider to Asterisk
An administration web interface for Mumble VoIP servers in PHP
Fast CGI-based AsteriskPBX cluster administration tool.
A complete invoice managment solution for Elastix PBX