Issabel PBX - Unified Communications
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
ICTCore: Unified Communications Framework for web developers
SMS, Fax, Voice Broadcasting and auto dialer Software
Open source Fax server software for inbound / outbound internet Faxing
VICIdial call center optimization tools, monitoring utilities, and per
Unified Communications Server
Java VoIP Softphone (SIP) (replaced by jfPhone)
Free software and hardware for telephony
VoIP/SIP Autodialer
Accent interfaces and controls systems through goals and policies
H.323 Gatekeeper for VoIP and videconferencing
Asterisk and kannel integration
SIP softphone
http://www.vaakpbx.com
SIP Video Multiconference Media Server with WebRTC support.
Callflow Sequence Diagram Generator