Open source Fax server software for inbound / outbound internet Faxing
Unified Communications Server
Unified Communications System - PBX System
Java VoIP Softphone (SIP) (replaced by jfPhone)
Project about FusionPBX on Live Medium
Kazoo Live Medium. From Null to a Full Featured PBX on minutes
CMS API Server with web site
OpenSource Call Center and Dialer System
Baresip is a modular SIP User-Agent with audio and video support
Optimized and cross platform SMPTE 2022 FEC library in C, Python, Java
A Skin for Mumble
Information on Asterisk cdr like ASR, ACD, Billing duration 'billsec',
C++ SIP stack based on Chrome source code