I self host prosody (an XMPP server) with a TURN server in my living room. With Guix System this is largely declarative, aside from the DNS records and initial

I self host prosody (an XMPP server) with a TURN server in my living room. With Guix System this is largely declarative, aside from the DNS records and initial user account registration (which I do on the command line). We're using it for messaging, sharing files, video calls across continents, etc. Re video calls: the XMPP and TURN servers are only used for negotiating the connection, so you don't need a very powerful machine for any of this. I have a little Rockpro64 for this purpose.