Virtual Box

Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software. Virtual Box has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once; for example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line, or possibly remotely.

http://www.virtualbox.org/

Win Tabber

WinTabber can add tabs to many windows: a tabbed browser, tabbed putty, tabbed terminal, or tabbed shell...tabbed anything! Multi tab your windows in seconds. A terminal or shell with tabs work faster and efficiently! Having multiple windows as tabs will give a better overview of your windows than before. Also having multiple SSH sessions by the click of a tab works faster and efficiently.

http://www.wintabber.com/