GXemul is a framework for full-system computer architecture emulation. 
Several processor architectures and machine types have been implemented. 
It is working well enough to allow unmodified "guest" operating systems to 
run inside the emulator, as if they were running on real hardware.

The emulator emulates (networks of) real machines. The machines may 
consist of ARM, MIPS, PowerPC, and SuperH processors, and various 
surrounding hardware components such as framebuffers, busses, interrupt 
controllers, ethernet controllers, disk controllers, and serial port 
controllers.

GXemul, including the dynamic translation system, is implemented in 
portable C, which means that the emulator will run on practically any host 
architecture.

The documentation lists the machines and guest operating systems that can 
be regarded as "working" in GXemul. The best working guest operating 
systems are probably NetBSD/pmax and NetBSD/cats.