@lazarus @daniel #XMPP is still a thriving ecosystem with lots of good FOSS developers doing interesting things.

XMPP is also used under the hood in tons of products needing instant messaging even if they are not advertised as XMPP clients, or do not federate.

Anyway, XMPP and #matrix all share a strong focus on protocols, but there is a big difference: https://chatmail.at does not expose protocols to client developers, just a Rust SDK.