I imagine there was a time when this wasn't obscure, but I'm guessing people today don't remember Caldera OpenLinux. That was the first Linux distro I installed/used. A guy from church gave his copy.
Caldera eventually became SCO. But I'm pretty sure I was using Caldera OpenLinux before the whole Novell patent suit thing.
Oh jeez. I forgot about that. I had that running on my DS back in the day from a GBA flashcart with a big-ass CompactFlash card sticking out the bottom. Good times.