@mattj is the creator and lead dev of the Prosody XMPP server.
@vanitasvitae works on the Smacks library and OMEMO-related stuff.
@nyconyco works on team-chat Nayego.
@lnj works on Kaidan.
and last but not least, @Goffi works on Salut à Toi.
@tdemin Forgot about Zash!
Why don't they federate anymore?
@firstname.lastname@example.org Mastodon has completely removed OStatus federation (over which GNU Social currently works) in 3.0. GNU Social appears to be working on AP support, but I don't have any details on that.
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