JPC - Computer Virtualization in Java - a PC emulator in Java. Strange.
emulation
PC Systems on the Mac
Who doesn't feel like paying Microsoft for Virtual PC and isn't exactly thrilled by the other well-known alternatives, might want to check out a less known one: iEmulator PC Emulator for MAC OS X is an emulator for the Mac based on QEmu. The special feature: not only the normal 32-bit Intel chips can be emulated, but also the 64-bit ones, as well as Sparc, ARM, and PPC. Pretty cool, that thing. And for those who find even the 25 dollars for iEmulator too much (or are hardcore OSS users), there's QEmuX - a free graphical interface for QEmu on the Mac.
To take it for a test drive, you can get suitable pre-prepared images from FreeOSZoo.
In initial tests, I had the usual problem: the keyboard layout just doesn't fit. You can only get something similar to a German keyboard layout, it doesn't fit exactly - the umlauts are off, some special characters are wrong, the whole thing is quite rough in that regard. Not that Virtual PC is any better: I could never properly enter the angle brackets and the pipe symbol under Virtual PC (which is pretty stupid for programmers).
Kallisys | Newton | Einstein Project
Das Einstein Project ist ein Emulator für die Apple Newton Hardware. Dadurch wird zwar der eigene Mac nicht kleiner (und damit auch kein Ersatz für den PDA), aber man kann wenigstens mit einem der interessantesten PDA-Betriebssystemen spielen. Gefunden in Rainer Joswigs Lispnews.
PearPC - About - Emulator für PPC-Hardware auf non-PPC Systemen
HP-12C für Mac OS X - Eine weitere Emulation eines HP-Taschenrechners
UADE - Unix Amiga Delitracker Emulator - an amiga music file player for unix - UAE-basierter Player für alte Amiga Sound Formate