QEMU

QEMU is a Free emulator.

Emulated Hardware
QEMU emulates the following hardware components
 * x86
 * Cirrus CLGD 5446 PCI VGA
 * RTL 8139+ PCI NIC
 * Intel i440FX chipset
 * PIIX3 ATA controller
 * PS/2 mouse/keyboard
 * 16550 serial ports
 * Sound Blaster 16 soundcard
 * ES1370 PCI soundcard
 * Gravis UltraSound (GUS) soundcard
 * Intel HD Audio soundcard
 * Intel 6300 ESB PCI watchdog
 * Intel iB700 ISA watchdog
 * Intel SB82371 UHCI USB host adapter
 * PReP (PowerPC reference platform) hardware
 * NE2000 PCI NIC
 * SPARC32
 * TCX Framebuffer
 * AMD Lance (Am7990) NIC
 * M48T02 NVRAM
 * Zilog serial ports
 * ESP SCSI controller
 * CS4231 sound card (work-in-progress)
 * SPARC64
 * UltraSparc IIi PCI bridge
 * M48T59 NVRAM

Resources

 * QEMU website