|Virtualbox logo introduced in 2010|
|First Release||January 15, 2007|
|License||GNU General Public License|
|OS||Windows, Mac OS X, GNU/Linux, or Solaris|
|R.A.M.||Host requirements plus guest requirements|
|Permanent Storage||30MB plus guest OS requirement|
Virtualbox is a popular virtual machine emulator by the Oracle Corporation, originally by Innotek (which was then acquired by Sun, and then Oracle). Virtualbox is an application, installed onto a host operating system, and is capable of hosting emulated systems, called Guest OSes. Virtualbox supports a large variety of operating systems, including most Linuxes, all recent Windows, UNIX and GNU/hurd and limited Mac OSX.
The core package for Virtualbox is open source, available under the GNU GPLv2. Previously, when owned by Innotek, it was a proprietary personal use and evaluation licence, which while free, was not free (as in freedom).