VirtualBox hem ücretsiz, hem de başarılı bir sanal pc yazılımı. Ücretlilerde gördüğünüz özellikleri VirtualBox'ta da görebiliyorsunuz. Ayrıca açık kaynaktır.
Konuk olarak destek verdiği işletim sistemleri şöyle:

* DOS
* Windows 95, 98, Me, NT 4
* Windows 2000, XP, Server 2003, Vista
* OS/2
* Linux
* FreeBSD, OpenBSD, NetBSD
* Netware
* Solaris

VirtualBox'un sade ve kolay kullanımlı arayüzü sayesinde kolayca konuk işletim sisteminizi kurabiliyorsunuz. Dilerseniz sihirbazlar yardımıyla da birkaç tıklamayla işinizi haledebilirsiniz. Bunun haricinde konuk işletim sistemine sabit disk, cd/dvd, usb, floppy disk, ağ kartı ve ses kartı gibi donanımlar de ekleyebiliyorsunuz.

InnoTek VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

Some of the features of VirtualBox are:

• Modularity. VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once: for example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line, or possibly remotely. VirtualBox also comes with a full Software Development Kit: even though it is Open Source Software, you don´t have to hack the source to write a new interface for VirtualBox.
• Virtual machine descriptions in XML. The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. Virtual machine definitions can therefore easily be ported to other computers.
• Guest Additions for Windows and Linux. VirtualBox has special software that can be installed inside Windows and Linux virtual machines to improve performance and make integration much more seamless. Among the features provided by these Guest Additions are mouse pointer integration and arbitrary screen solutions (e.g. by resizing the guest window).

Presently, VirtualBox runs on Windows and Linux 32-bit hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista), DOS/Windows 3.x, Linux (2.4 and 2.6), and OpenBSD.