DOSBox - An open source DOS emulator for BeOS, Linux, Mac OS X, OS/2, and Windows. Primarily focuses on running DOS Games.
DOSEMU - An emulator of the Microsoft Disk Operating System (MS-DOS) for Linux/X11. Enables Linux to run many DOS programs - including some DPMI applications.
Flopper - Open source bootable-disk emulator - it reads a diskette image file (a file that includes all the sectors of a floppy disk) and boots it. This way, users can boot and run a bootable diskette off of their hard drive.
MacWindows - Solutions for integrating Macintosh and Windows.
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