VirtualBox – Open Source General Purpose Full Virtualizer
http://www.virtualbox.org/

InnoTek VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU Public License (GPL). InnoTek VirtualBox is a general-purpose full virtualizer for x86 hardware and is targeted at server, desktop and embedded use. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.