QEMU 2.3.0 / 2.4.0 RC1 for linux full final free download
QEMU is an open source and very fast virtualization software that focuses on dynamic translation to achieve reasonable performance, while being easy to port to new host CPUs (processors).
A powerful machine emulator and virtualizer
It is also known as a machine emulator, engineered to emulate a full system, including a processor and its peripherals. The emulation part supports operating systems and programs created for a single hardware platform, but running on top of a different computer with a different architecture.