I agree, what is the purpose here? The first thing I thought was, "does he know he can run the vast majority of Linux software natively under OS X?" That's the beauty of tools like fink and macports. If you find something you want to use, "sudo port install foo".

Even X Windows apps compile, install, and run fine.

The whole reason I made the switch to OS X (from linux) was that I had everything I wanted on the Unix side via Darwin, plus a commercial desktop with commercial app availability.

I'm not sure I'll ever understand questions like this.

-nedrow