https://jabberd2.org/ is completely dead now. See https://github.com/jabberd2/jabberd2 and https://github.com/smokku/jabberd3 (its supposed next-gen version)

Interestingly, its preceding version https://gitlab.com/jabberd/jabberd is back in development (but likely years behind anything else out there) !XMPP

(NOTE: we’re going with #ejabberd and #prosody here.)