XMPP is an open, decentralized universal messaging standard, similar to matrix.
We host the Ejabberd XMPP server.
Registration
We do not have a webclient for XMPP. Hence, you need to first install an XMPP client.
We recommend Gajim on PC and Conversations on Android.
You can find a list of clients at xmpp.org.
Once you have installed your favourite client, you can follow the normal signup procedure.
Pubnix Authentik is not supported on our XMPP instance however.