This page lists XMPP-related software, and their status in Debian. Please feel free to package any of the software listed on this page that hasn't already been packaged or ITPed!
Also, some Debian developers can be reached via XMPP, e.g. by the Debian XMPP server. In this case the XMPP id (JID) is identical to the email address. E.g. a DD reachable via mailto:email@example.com would be also reachable via xmpp:firstname.lastname@example.org. See UnifiedCommunications/DebianDevelopers/XMPP for details.
Some XMPP related software in Debian is maintained by the XMPP packaging team. Ejabberd is maintained by the Ejabberd Packaging Team, other packages by other teams or by individual maintainers.
libiksemel (XML parsing library, not solely used for XMPP)
libsignal-protocol-c (for OMEMO)