Came across this on the r/selfhosted community. Still very much in the alpha stages, but it’s already got a Docker image you can try out for yourself, or try out the demo server.
Tried it earlier today, couldn’t get the voice/video chat to work right away on my self-hosted setup but the real-time chat was very snappy. Looks promising.
Yup, saw some stats from screenshots on there, their mail service had a cap of 300 mails monthly and it blew up to over 50 000. Verification/mail servers went up again yesterday at 4am CET but still seems like the authentication servers are pretty overrun.