Asterisk - An open source telephony switching and private branch exchange service for Linux.
Video SDK from Zoom - Build fully customizable video-based apps
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.
Amazon Chime - Online meetings and video conferencing
Kamailio - Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under...
100ms Live - Video and Live Streaming infra for a video-first world