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Gee, I had my own list (off the top of my head):

1. CP/M 2.2, the 8-bit Z80 standard! (CP/M86 for those who are stuck in x86 land) 2. AmigaOS with Intuition interface 3. BeOS-Amiga for the '90s! 4. NeXTstep-Why settle for Apple's kludge when you can have the original? 5. AtariST OS with GEM (Graphical Environment Manager, also available for Ventura Publisher on the IBM PC AT) 6. MSX, the 8 bit standard by Microsoft. A stable standard minted in the 80s and adopted by a variety of Japanese computer desktop manufactrurers, and SpectraVideo/Bondwell. 7. OS8. You need a mini-computer like a PDP-8 to run it, but it can generate 4KB virtual machines. You can also repair the core memory and papertape yourself with a little training. 8. So many other proprietary systems with their own plusses: Acorn, DEC Rainbow DOS, Coleco's ADAM with Apple II (almost) compatible BASIC.