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VirtualBox is virtualization host software that runs as an application on an established operating system. With VirtualBox you can install it on your existing Operating System and create and manage guest virtual machines, each with a guest operating system and its own virtual environment. VirtualBox runs on Windows, Linux, Macintosh, and Solaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7, Windows 8), DOS/Windows 3.x, Linux (2.4, 2.6 and 3.x), Solaris and OpenSolaris, OS/2, and OpenBSD. The core of VirtualBox is free software released under GNU General Public License version 2 (GPLv2).== Features ==This is not a comprehensive list since virtualbox is truly very large in scope and capability.* Open Source.* Free Software.* 64-bit Guests.* Full Virtualization.* Linux, Windows, Mac, DOS, Novell, Solaris Guests.* Cross-Platform Host Support.* Guest SMP Support up to 32 vCPUs.* USB Support.* Full ACPI Support.* Dynamic Screen Resolutions.* iSCSI Storage Support.* PXE Network Booting.* Snapshot Support.* Remote Machine Display.* Extensible RDP Authentication.* USB over RDP.* Guest and Host Shared Folders.* Guest Additions ( Think VMware Tools).* Command Line Capability.* OVF Support.* VM Import/Export.* Thick and Thin Provisioning.* Wizard-driven VM Creation.* Easy to Install and Operate.