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I run transmission on a headless box and only open the remote GUI for it once in a while. Can other bittorrent clients do that out of the box?

Yes, probably most of them

Names? :)

qbittorrent has one, https://wiki.archlinux.org/title/QBittorrent (search “web interface”)

Deluge, QBittorrent, rTorrent, uTorrent have web UIs. Deluge also has a remote mode in the desktop app.

Well when you say "web UIs" i think of another tab that will expand to 4+ G ram if left open long term...