Well, I'm not running it currently for reasons, but I used to host a Jellyfin media server on my desktop, but that was inconvenient as it was the desktop I was actually using. Eventually I switched from Pop!_OS to Fedora which lacked Jellyfin transcoding support and I had to stop hosting it. In a few days I should get a 1050ti to complete the setup and then I will be back up and running on my first dedicated server. I will probably look in to hosting a mail server, a nas, bitwarden, and possibly a librex or searx search engine on it once it is up and running. It is an old system with 3gb of ddr2 and an athelon 64 x2 from 2005 but it should do the trick for everything I want out of it. Right now I am just hoping that the new GPU doesn't trigger current protection on the cheapo PSU that is in there.
Edit: I'm also going to set up an i2p seedbox for obscure torrents.