KOOKOO - All in one solution for calls, IVR, live chat, customer management & more.
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
Ameyo - Ameyo is a powerful and highly flexible IP-based contact center software that lets you have a personalized interaction with every customer across multiple channels, thereby driving customer engagement to a level par excellence.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
HoduCC - HoduCC is a FreeSWITCH based product which offers contact center softwares for call centers.
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.