freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
WhatsApp Business - Communicate more efficiently with your customers
Asterisk - An open source telephony switching and private branch exchange service for Linux.
WATI - No-code chatbot builder for WhatsApp Business
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.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.