Issabel PBX - Unified Communications
VICIdial Contact Center Suite
Browse on Tor / i2p - Anon p2p Chat / FileTx, Conf / Video VoIP
VoIP/SIP SoftPhone (formerly known as jphonelite)
Unified Communications System - PBX System
Java VoIP Softphone (SIP) (replaced by jfPhone)
Accent interfaces and controls systems through goals and policies
Enterprise telephony recording and retrieval system
ERP, IP PBX, Accounting, CRM, Time tracking, and etc.
Android device manager for PC, download apps, transfer and data backup
Cress is a comprehensive toolset for graphical service/workflow design
A simple noise gate app intended for use with VOIPs like Skype.
This project has been relocated to http://github.com/sippy/rtpproxy h