I was going to point out some, but mhurron did a much better job. One of the odd things I remember is that VMS had a version of Diskeeper that predates the NT version.

I don't like Microsoft, but I have no issue in recognizing their technical merits when they have some. I'm using a Microsoft keyboard right now and was, for a very long time, an MCSD. What people misinterpret as an anti-Microsoft bias is, usually, the effect of a wider perspective than the average Microsoft enthusiast.