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Outreach - Outreach Is Your Sales Communication Platform
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
SalesLoft - The simpliest way to build the most accurate and targeted lists of leads on the internet
Asterisk - An open source telephony switching and private branch exchange service for Linux.
Yesware - Sell smarter with email tracking and more
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.