At least it ain’t VHDL, which stands for VHSIC Hardware Description Language, or, in full, Very High Speed Integrated Circuit Hardware Description Language. Its name is as much of a clusterfuck as the language itself.

I’ve used XMPP for this before, using ejabberd as the server and Conversations/Monal as the client, it worked pretty well, altho ejabberd can be a bit of a handful to get running initially.

I haven’t tried running a matrix server, but ejabberd has been very solid, and it’s not too difficult to set up.