Let's face facts, your Mac games rock, but your Windows PC-using friends have pointed out some pretty cool mods and expansion packs for their games over the years.
And they WERE pretty cool.
Moving beyond the fact that both Boot Camp and virtualization programs are out there and you could readily switch over to the Windows partition on your Mac or boot a program like Parallels, Fusion or CrossOver and work with game mods that way, we'd like to offer the following five native Mac OS X games with accessible expansions and downloadable levels, the expansion installations ranging from least to most technical.
You know the iPhone is very powerful, but did you know that it can handle some of id's really graphics intensive games, too? John Carmack, the man who brought Doom to our hearts and to our computers, demonstrated Rage on the iPhone during his keynote speech at QuakeCon 2010. The game was running at a very normal 60 frames-per-second, better than the abilities of the Xbox or Playstation 2.
Carmack's demonstration only shows what the iPhone hardware is truly capable of, especially now that the processors are getting beefier with each iteration. The game was shown demonstrated on an iPhone 4, but it could probably, very easily, run on an iPhone 3GS.