DOSBox Save
An open source DOS emulator for BeOS, Linux, Mac OS X, OS/2, and Windows. Primarily focuses on running DOS Games.
http://dosbox.sourceforge.net/   

DOSEMU Save
An emulator of the Microsoft Disk Operating System (MS-DOS) for Linux/X11. Enables Linux to run many DOS programs - including some DPMI applications.
http://www.dosemu.org/   

Flopper Save
A bootable-disk emulator - it reads a diskette image file (a file that contains all the sectors of a floppy disk) and boots it. This way, you can boot (and run) a bootable diskette off of your hard drive.
http://www.oldskool.org/pc/flopper/   

MacWindows Save
Solutions for integrating Macintosh and Windows.
http://www.macwindows.com/   

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