Summary: QEMU is a generic machine emulator and virtualizer. It can emulate other CPU and host architectures, or run native binaries with native performances by executing the guest code directly on the host CPU any only emulate devices. It's thus often used in conjunction with KVM on Linux for system virtualization.
Summary: An open source and very fast machine emulator/virtualizer. It can emulate processors based on many various architectures (eg. x86, ARM, MIPS, PowerPC). Run with "-display sdl" flag to avoid the display glitches.