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jitsi
Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, IRC and many other useful features.
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Civic Auth
Auth in Less Than 5 Minutes. Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
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FirebaseRTC
Discontinued Codelab for building a WebRTC Video chat application using Firebase Cloudstore.
You may wanna look at WebRTC (https://webrtc.org) as thats the technological foundation of what youre looking to do.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.