Open source Fax server software for inbound / outbound internet Faxing
ICTCore: Unified Communications Framework for web developers
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
Unified Communications Server
Java VoIP Softphone (SIP) (replaced by jfPhone)
Free software and hardware for telephony
Baresip is a modular SIP User-Agent with audio and video support
Optimized and cross platform SMPTE 2022 FEC library in C, Python, Java
Respins of various open source PBX projects
Web interface for OpenSIPS
C++ SIP stack based on Chrome source code