DOSBox: MS-DOS Emulator for Mac OS X
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Remember the good old days when computers had x86 chips and MS-DOS was the central operating system for everyone? It did seem like you needed much more technical knowledge to properly use a computer.
DOSBox allows those of you still nostalgic for that not-so-long-ago time to emulate games and applications that ran under DOS. Obviously, you will still need to remember all the basic DOS commands to mount and launch applications or simply search through directories.
The advantage DOSBox has over other emulators is that it doesn't limit itself to games. Remember a great application you used to run on DOS, years back? If you find it, there's a good chance it will work in DOSBox.
DOSBox can emulate any game or application that used to run under MS-DOS. You'll need to be comfortable with DOS commands to use DOSBox though.