QEMU - QEMU (short for "Quick EMUlator") is a free and open-source hosted hypervisor that...
oVirt - oVirt is a virtualization management application.
bochs - Bochs IA-32 Emulator provides a virtual PC that can run operating systems such as Windows, Linux, and BSD.
VirtualBox - VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as...
clearVM - The best-looking virtualization platform on the planet. With the fastest setup. Ease of use. And zero maintenance.
VMware Workstation - VMware Workstation is a multiple operating system handler to easily evaluate the any other type of new operating systems.