"Quick, name some virtualization programs that run on Linux.
"If you're like most people, you probably named VMware or Xen
first. Many of you probably know of one or more of the following:
Parallels, QEMU, KVM, Virtuozzo and OpenVZ. However, few of you
probably know about VirtualBox. And chances are if you know about
VirtualBox 1.502, you're already running it because it manages the
trifecta of being good, free and, sort of, open source..."