Quick, name some virtualization programs that run on Linux. Time’s up. 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.