Check out these when you got some time to kill...
http://www.downloadsquad.com/2009/06/20/free-open-source-cross-platform-games/Regardless of what operating system you run on your computer, it doesn't have to be all work and no play. Heck, that could turn you into some kind of axe-wielding homicidal maniac bent on destroying your own family while watching over a remote resort hotel in the dead of winter.
I'd certainly never want that to happen to any of our DownloadSquad readers, so here's a list of games that you can install on Windows, Mac, and Linux (and some even on BeOS and BSD). Enjoy!