Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
Genesys - Genesys provides omnichannel customer experience and contact center solutions in the cloud and on-premises.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
KOOKOO - All in one solution for calls, IVR, live chat, customer management & 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.