Honestly, IRC was a very functional, easy, free, low-resource and privacy friendly chat protocol and I don't really see why it got left behind. If you wanted image/ file support that could really be implemented client and/or server side.
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IRC is still in use by several open source projects, and it can be nice for quick and open public chatting for meeting people,and to ask questions.
odf/odt/ods
.md
SimpleX
Matrix
OpenPGP
Last, certainly not least... ActivityPub
SimpleX. No federated messenger is good for privacy.
But I see how SimpleX is impossible for public groups, as spam is basically unavoidable.
Does it support video calls?
Yes, also PiP now
SimpleX was nice when I used it for small chats, but how is it with large groups? Matrix really drags ass with large rooms, even on native clients.
Never tried that. For sure it lacks spaces, threads, moderation, invite links, requests etc.
Correct me if I am wrong
Stream Control Transmission Protocol. It’s the Betamax of low level networking.
https://en.wikipedia.org/wiki/Stream_Control_Transmission_Protocol
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