Matrix reference homeserver
VICIdial Contact Center Suite
Customer Relation Management Software with CTI integration support
Open source Fax server software for inbound / outbound internet Faxing
ICTCore: Unified Communications Framework for web developers
The most affordable CRM system according to Capterra
Unified Communications Server
Online Internet Phone Call Center Software For Telesales Team
Enterprise telephony recording and retrieval system
SIP Video Multiconference Media Server with WebRTC support.
Cress is a comprehensive toolset for graphical service/workflow design
CMS API Server with web site
A complete invoice managment solution for Elastix PBX
VozBox. Asterisk VoIP PBX.
OpenSource Call Center and Dialer System
CRM system based on vtiger, adapted to Polish companies.