Matrix reference homeserver
Java wrapper for the popular chat & VOIP service
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Open source Fax server software for inbound / outbound internet Faxing
SMS, Fax, Voice Broadcasting and auto dialer Software
ICTCore: Unified Communications Framework for web developers
VICIdial call center optimization tools, monitoring utilities, and per
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
Convert VoIP calls to text and analyze them with AI
Issabel PBX - Unified Communications
Unified Communications Server
Java VoIP Softphone (SIP) (replaced by jfPhone)
Free software and hardware for telephony
High performance, production quality STUN server and client library
VoIP/SIP Autodialer
Kazoo Live Medium. From Null to a Full Featured PBX on minutes
Accent interfaces and controls systems through goals and policies
Asterisk and kannel integration