VirtualBox is an application installed on an existing host operating system; within this application, additional operating systems can be loaded and run, each with its own virtual environment. For example, several Linux distributions can be hosted on a single machine running Windows XP; likewise, XP and Vista can run on a machine running Linux, and so on. There is a free for personal or evaluation use proprietary version and a GNU General Public License (GPL) version.
Features:
Modularity
Virtual machine descriptions in XML
Guest Additions for Windows and Linux
Shared folders
Virtual USB Controllers
Remote Desktop Protocol
USB over RDP
Whats New:
VirtualBox
This is a maintenance release. The following items were fixed and/or added:
GUI: position off-screen windows to be fully visible again on relaunch in consistence with default-behavior (bug #15226)
GUI: fixed the View menu / Full-screen Mode behavior on Mac OS X El Capitan
GUI: fixed a test which allowed to encrypt a hard disk with an empty password
GUI: fixed a crash under certain conditions during VM shutdown
GUI: fixed the size of the VM list scrollbar in the VM selector when entering a group
PC speaker passthrough: fixes (Linux hosts only; bug #627)
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