Off the top of my head just nostr relay from umbrel, and maybe just poke around umbrel.

There have been many pi projects, that didn’t really require gpio, where I glanced over and then remembered pi’s were way over priced. I know you can easily add gpio to a nuc/miniPC if needed.

The affordable x64 options all seem to come from companies like bmax or beelink which I’ve seen good things said about on YouTube, but there are tons of these dell & hp x86 slight older mini pc’s that institutions are essentially tossing out the window that are alluring, and in my basic consumer mind won’t be melted a year later 💁‍♀️