NetBSD is so cool, and I have so many machines sitting around I need to get running on (SGI, Alpha, Dreamcast, etc.)
Sadly I’ve heard it can be rough on older architectures still. I’ve been told, that at least on VAX, for example is not in the best of states because usermode dependencies on Python. From what I was told, Python currently doesn’t have a VAX port due to the architectures floating point design.
Old hardware is always useful.