It seems like the question that comes up a lot is what non-casual games are on the Mac. Beyond the ports of AAA games that came to the Mac much later than their Windows counterparts, there have been some companies who do support Mac and PC right out of the box natively, Blizzard being one of the more notable.
Utilizing the power of the Unity game engine, you can quite easily port a game to both platforms without much “tweaking” at all. With Unity gaining popularity (http://unity3d.com/gallery/game-list/) you’re likely to see more cross platform titles being developed. For example, we are and indie developer, but we are making what we consider to be a AAA quality game that will be for Mac and PC right out of the box. You can check it out at www.ascensionwar.com or look us up on Facebook at http://www.facebook.com/ascensionwar
