Asterisk - An open source telephony switching and private branch exchange service for Linux.
DialMyCalls - The easy to use mass and emergency notification platform. Send a phone call, text message or e-mail to your entire list of people in seconds.
Wazo.io - The UCaaS Platform Built for MSPs
InformaCast - InformaCast is a leading mass notification software solution that helps organizations reach everyone with critical information.
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.
SnapComms - SnapComms, An Everbridge company, provides internal communication solutions for organizations.