As other folks have mentioned, Zulip has a number of cross-server integrations with both the Zulip protocol and other protocols like XMPP. There's a few we doc

As other folks have mentioned, Zulip has a number of cross-server integrations with both the Zulip protocol and other protocols like XMPP. There's a few we document here as well as Matterbridge: * https://zulipchat.com/integrations/communication https://zulipchat.com/integrations/communication * https://github.com/42wim/matterbridge https://github.com/42wim/matterbridge We'll eventually add a more native way of connecting a stream between two Zulip servers; we just want to be sure we do that right; federation done sloppily is asking for a lot of spam/abuse problems down the line. (I'm the Zulip lead developer)