There are tons of it, it really depends on how much time are you willing to invest to set it up vs how many features you want. Taiga, kanboard and leantimes are all viable alternatives. My best bet would be redmine, with a couple of plugins it can provide everything you need and more. I don’t think there is a single docker container but there are a couple of prebuild VMs that we used successfully for a while and on the plus side is no feature are locked behind some subscription model like other powerful alternatives.

My potato server died a few months ago and since I’ll be moving shortly I’m not rebuilding it right know. So I bought a simple intel nuc, slapped an old HDD inside and connected to the TV.

Jellyfin runs in the the background but I access it throght Kodi. Jellyfin is accessed directly only if my wife want to watch something from her study.