I am looking for a package that would run on a Fedora Core host that would allow me to run multiple operating systems simultaneously. I've googled a couple of alternatives, but I am not sure that they are right for the job. The ones I found were Xen, Plex86, and UML. From what I read, UML and Plex86 do not allow you to run a Windows OS as a vm (which is one of my requirements). I've seen some negative things about Xen too, so I was just looking for alternatives.

Ideally, I would be able to:
- Run multiple vm's simultaneously
- Run both Linux and Windows OS's
- Be able to restore any vm from a "snapshot" to a point in time

Thanks for any help