Matrix reference homeserver
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Issabel PBX - Unified Communications
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
SMS, Fax, Voice Broadcasting and auto dialer Software
Unified Communications Server
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
http://www.vaakpbx.com
SIP Video Multiconference Media Server with WebRTC support.
Connverts RADIUS acccounting messages to ETSI OSP CDRs
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