VirtualBox 3.2.2 (2010) - Virtual PC
Size: 72.9 MB
VirtualBox - System virtualization, similar to VMware Workstation and MS Virtual PC. Supports dynamic translation - to most of the instructions guest OS is on real hardware. As the host systems are supported 32 - and 64-bit versions of Linux, Windows, Mac OS, Solaris, as well as guest can serve Windows, GNU / Linux, BSD, Solaris and other operating systems.Size: 72.9 MB
For those who have not heard of VMWare and Microsoft VirtualPC: These programs are designed to create a virtual machine with the real parameters of iron (your) computer, which can run any operating system. It is a handy feature, for example, for testing.