To answer my own question:
- E-mail (postfix, dovecot, rspamd, clamav)
- Web (nginx), various small websites including my homepage
- Fediverse Microblogging (Mastodon)
- Matrix Chat (synapse)
- XMPP Chat (prosody)
- Music streaming (mpd, snapcast)
- Home automation (home assistant and my own lighthome stuff, mqtt)
- IRC bouncer (znc)
And the basics of course:
- SSH (openssh)
- NFS
All running on an Ubuntu Linux server, but everything is containerised into mostly Alpine Linux podman (rootless) containers (and a few lxc containers which I'm phasing out).