Microsoft - DOS/Windows OS Emulators

Name	Description
Bochs	Bochs is a decent PC emulator for Mac. Over the years it has gotten much, much better.
Darwine	The Darwine project intends to port and develop Wine as well as other supporting tools that will allow Darwin and Mac OS X users to run Windows Applications. It's a Mac fork of Wine.
DosBox	DOSBox is a cross-platform emulator of a PC with DOS. It can run games written for DOS out of the local file system. The emulator is still under heavy development and it runs about 60% of the games it was designed for.
PCE	PCE is an IBM PC 5150 emulator. It emulates most of the hardware of an IBM PC 5150. The emulation is complete enough to boot DOS and run most DOS applications. PCE was written in ANSI-C and is licensed under the GNU General Public License, Version 2.
PCx	PCx is a freeware emulator for Mac. It has complete 486SX emulation, with partial 586 emulation. It has no sound support, has only standard VGA video, and according to the authors, no updates to PCx will be released.
VirtualPC	VirtualPC is a commercial PC emulator for Mac. It is the best PC emulator you can buy. It is much better than the freeware emulators available.

Microsoft - DOS/Windows OS Emulators on Other Platforms

Windows/DOS (7)
Unix/Linux (4)
BeOS (1)
Consoles
-- Playstation 2 (1)
-- Nintendo DS (1)
-- Nintendo Wii (1)

Emulators For:
Windows/DOS
Unix/Linux
BeOS
Macintosh
Amiga
Consoles
Java
Palm OS
Pocket PC
Digital Cameras
Digital Phones
Calculators
QNX
Windows Mobile Smartphone
Microsoft Silverlight

Other Releases
Extenders
Frontends
ROMs (Public Domain)
Hacks
Cheats
Movies
Savestates
Music
Technical Documents
Translations

Utilities:
General
Auditing
Cheating
Development
Game Modification
Music Playback / Manipulation
Plugins