Okay, actually, there are a number of virtualization options not listed in the title, but the one nobody seems to be talking much about Sun’s xVM VirtualBox. But, wait! you say, Sun begs to differ: “Sun xVM VirtualBox software is the world’s most popular open source virtualization platform because of its fast performance, ease of use, rich functionality, and modular design.”
Some cool features of VirtualBox include:
• Seamless windows - rather than a whole desktop environment, just the guest application windows can co-exist alongside native host applications.
• Shared Folders - easily move documents and files between the host and guest systems.
• Mouse pointer integration - it just works how you’d expect it to.
• Dynamically adjustable screen resolution in the guest.
• Time Synchronization.
• Shared clipboard.
A lot of that is available elsewhere (e.g., time sync and shared folders), but seamless windows is a nice touch.
AND, VirtualBox is open source!
Do check it out.