VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Open source Fax server software for inbound / outbound internet Faxing
Unified Communications Server
High performance, production quality STUN server and client library
VoIP/SIP Autodialer
SIP softphone
H.323 Gatekeeper for VoIP and videconferencing
Callflow Sequence Diagram Generator
A command line utility for remote controlling Polycom VVX IP phones
Java VoIP/SIP PBX system (replaced by jfPBX)
An administration web interface for Mumble VoIP servers in PHP
Webface witch extract CDR (Call Detail Records) from MySQL base.
Cyber-wrt pbx is embedded system in DD-Wrt router