Platform: Linux, Windows, Mac, BSD, BeOS, they basically made this so it runs on anything.
Ah, sweet nostalgia. This free DOS emulator emulates a classic DOS environment, as if you were using an old 386 or similar processor. It has virtual sound cards and drivers that are compatible with old games, so you can get the full multimedia experience with proper colors and sound. This is incredibly desirable for the classic gamer, as NT based OS, such as XP and Vista often have trouble running DOS games properly.
DOS box is very customizable via it’s configuration files. I so far have been able to get every game I have tried to work, after some tweaking.
Download: http://www.dosbox.com/download.php?main=1
List of supported games (very extensive): http://www.dosbox.com/comp_list.php