You forgot BeOS, which lives on in Haiku. One of my favorite "alternative" operating systems of the time. I still wish I had more hours in the day so I could hack on Haiku once in a while.
This is not sarcasm by the way. I like being nostalgic and apparently I like system related stuff as opposed to web programming. But keep doing what y'all did.
It was fun back then.
I think I'm going to grab my time machine and warp back.