Haiku is the current continuation of the old discontinued BeOS system. I had the BeOS installation CD a long time ago and played with it a little when it came out. It didn’t catch on and sort of fizzled out. But lived on as an open-sourced Haiku.
I was surprised to find Haiku as a form of BeOS still hanging around the internet. I have been curious about the various OS that have been developed and how the usability of the different OS compared against the big giant Microsoft and the interesting Linux OS.