MirrorFly - World's Most Scalable Voice, Video & Chat SDK for Small, Medium & Enterprises
Ring4 Meeting - Dead simple video conferencing - free, in browser
echofin - Echofin helps communities grow, engage and monetize their following in ways no other platform has done so far.
Stork.ai - AI-Based Collaboration for Hybrid Teams. Rich media messaging, advanced video and voice conferencing, auto-transcribing and screen sharing. Serendipitous meetings at the water-cooler with your human and AI teammates.
chatwee - Group chat app for online communities. Used wherever visitor interaction and engagement are key to the site's functioning.
openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.