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Time for an ICQ for the Fediverse?
(aus.social)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
what do you have in mind? Jabber/XMPP is very similar.
It runs on any old raspberry pi (any but raspberry pi 1 I believe) in your house, can be used by family and friends as well. Has iOS and Android apps... I have had good experiences with the easy to set up https://snikket.org/ XMPP server.