VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

This FREE virtual machine runs Vista, XP, and Linux flavors like a champ in Mac OS X Leopard!

Here are some screenshots.

If you need an industrial project management tool comparable to Microsoft Project, Merlin by ProjectWizards may be a good choice.