Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...

Twilio Video - Real-time video infrastructure and SDK

Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.

Ziggeo - Cloud-Based Video Recorder / Player. Award-Winning API + Server Side SDKs

RaidCall - Free & Light. Setting up is fast and easy; with no need to rent or set up servers. Low CPU usage and minimum memory footprint allows for smooth, uninterrupted communication. im. Group Communication.

Amazon Chime - Online meetings and video conferencing