Asterisk - An open source telephony switching and private branch exchange service for Linux.
XperienCentral - XperienCentral is an open API content management solution that allows you to add, edit or remove content without having to touch a line of code.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
Crownpeak - CrownPeak provides SaaS-based Web Experience Management for Global 1000 digital marketers who want to launch enterprise websites fast.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
Optimizely Digital Experience Platform - Optimizely Digital Experience Platform is a digital experience platform offering A/B and multivariate testing tools that empower digital marketers without code and enable data-driven decisions.