So here is what I'm currently working with:
Tiny Linux computers for embedded applications.
The development kit is a little spendy, and this isn't a recommendation. However you are now aware of something maybe new to you. This is something you might find on some retired engineer's estate table at a hamfest. They are also in a common electronic device used by many corporations, so you will find them in the wild.
I'll leave potential applications of a really tiny Linux computer up to your imagination.