qemu

QEMU is a generic and open source processor emulator which achieves a good emulation speed by using dynamic translation. QEMU has two operating modes:

• Full system emulation. In this mode, QEMU emulates a full system (for example a PC or a PowerMac), including a processor and various peripherials. It can be used to launch different Operating Systems without rebooting the PC or to debug system code.
• User mode emulation (Linux host only). In this mode, QEMU can launch Linux processes compiled for one CPU on another CPU.