[Managor]

Also contains a headless server named qbittorrent-nox. I use it in my server.

[freedomben]

Transmission is also great for this. You can run it completely headless, or you can run the GUI locally and connect via web interface remotely. It's very flexible and has been great to work with.

[IntelMiner]

Deluge was my go-to for this for years and years and years. More diversity in this ecosystem is good to see

[Cyph0n]

qbittorrent + gluetun works like magic (if you’re running containers).

https://github.com/qdm12/gluetun