Seedhost.eu supports these “addons” out of the box:
SABNZBD
rTorrent - ruTorrent
RAPIDLEECH
Resilio
Transmission
Autodl-irssi
Deluge
MakeTorrent
Subsonic
ZNC
Sickbeard
Sickrage
Couchpotato
Madsonic
Pydio
Fileshare
Ratiocolor
NZBGet
Headphones
Pyload
Syncthing
Jackett
Sonarr
Radarr
Watcher
Mylar
Lounge
Shout
Medusa
NZBHydra
Airsonic
Lidarr
Prowlarr
Bazarr
Readarr
Flaresolverr
Qbittorrent
Filebrowser
Overseerr
NZBHydra2
autobrr
Wireguard
OpenVPN
and you have SSH access, so you can actually do a lot more stuff, but no root access.
I mainly used it for torrenting and the speed was always awesome. Great for seeding of course.
If you get a bigger one it might be worth running plex on it, but on smaller shared instances plex encoding performance can be bad, also depending on the size of your video files.