Got a Mac ? You can probably find uses for Parallels. Even if you don't need to run GNU/Linux, or Windows, or a miriad of other things - you can run different versions of OS X as virtual machines as well.There are other ways of running Windows, GNU/Linux, and others on your Mac, but if you value your time, then Parallels is probably the quickest and easiest way to do it. For many guest OSs, setup is mostly automatic - you just set things like memory and disk sizes - and the setup wizard does nearly all the work for you.Five stars from me.
