Software per Call Center
Java wrapper for the popular chat & VOIP service
PHP version of Google's phone number handling library
Customer Relation Management Software with CTI integration support
VICIdial Contact Center Suite
A WebRTC-Enabled Chrome Extension for Seamless Call Center
Desktop communication tool: chat, telephony, multimedia
The most affordable CRM system according to Capterra
Unified Communications Server
A beautiful SMS messenger for Android
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.
H.323 Gatekeeper for VoIP and videconferencing
SIP Video Multiconference Media Server with WebRTC support.
Cress is a comprehensive toolset for graphical service/workflow design
Java VoIP/SIP PBX system (replaced by jfPBX)
JAvascript Voicexml InterpretER
Android Telemarketing (Junk) call blocker