VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product 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 General Public License (GPL) version 2.
Virtualbox is available in 28 languages.
Portable-app version: http://www.techbeta.org/category/portable-apps
Note: VirtualBox and VirtualBox OSE are now one
With version 4.0, there is only one version any more, which is open source, and the closed-source components have been moved to a separate extension pack.
https://www.virtualbox.org/wiki/Editions
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