This is remarkably cool. “Plan 9 occupies an interesting niche in the open source operating system world. It is a full-fledged descendant of Unix, but not in the way that most systems out there are. It took the bones and beating heart of Unix and then built a brand-new cybernetic exoskeleton around it, with lasers, and heat vision… oh wait. You want to boot this bad-boy up, right? Well, okay, we’ll do that. But what hardware shall we run it on? Hey, you got a Raspberry Pi? Well then, read on!” A ready-made image to run Plan 9 on your Pi.