As far as I’m aware WS is pretty close to what you get by just using virtalbox (with an easier setup) so you could do that on Linux. With Linux you also have more advanced solutions though like https://en.wikipedia.org/wiki/Qubes_OS

So maybe a tag system where each tag also has a type. E.g. NSFW, flair, category, where each type have multiple possible tags. Also maybe some tags can be set by the poster and some can be set by mods or maybe they could even be set by the users where the top-n most chosen are visible on the post.