Matrix reference homeserver
Java wrapper for the popular chat & VOIP service
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
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
Issabel PBX - Unified Communications
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
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