There are a few lists that show servers that allow free registration, here is another one: https://xmpp-servers.404.city/

Self-hosting of course recommended ;)

(Background: blabber.im closing down their servers, but the app remains available)

poVoq
creator
link
fedilink
51Y

another more automated list: https://the-federation.info/protocol/xmpp

XMPP/Jabber
!xmpp

    Extensible Messaging and Presence Protocol (XMPP) is a communication protocol for message-oriented middleware based on XML. Learn more about it here.

    Dedicated Lemmy instance

    XMPP.net Provider List

    Also see JoinJabber.org FAQ

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