FreeCiv is a freeware version of Civilization that I still play. They have linux and windows releases.
"But didn't Apple spend a whole ton of money to write and maintain Mac OS X"
Yes, in EXACTLY the same way Microsoft did with Windows. So why is it that Microsoft can't say "You can only run Windows on Microsoft created computers."? Heck! There's an instant monopoly. Drive HP, Dell, Acer, and Sony right out of business!
I've NEVER understood why Apple thinks that they can dictate this. The Franklin case in '83 shouldn't even apply. (That case was based on modifying apple software and reselling it.) Apple's entire case is based on a shaky interpretation of what an EULA allows and an even shakier and broken US patent office.
Of course, Apple can't afford to NOT challenge Psystar. They have to try and challenge them and try to slap them down hard. There is a fairly good chance that they can even win if they bring enough force to bear and get a sympathetic or under informed judge, allowing them to maintain their monopoly.
Personally, I think Psystar has a stronger case but Apple has more money. It will be interesting to see how it plays out.
UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. -- Doug Gwyn