对于VMWare、Virtual PC这些虚拟机软件，可能大家都比较熟悉。VirtualBox是德国一家软件公司InnoTek所开发的虚拟系统软件，它不仅具有丰富的特色，而且性能也很优异。更是开源的，成为了一个发布在GPL许可之下的自由软件。VirtualBox 可以在 Linux 和 Windows 主机中运行，并支持在其中安装 Windows (NT 4.0、2000、XP、Server 2003、Vista)、DOS/Windows 3.x、Linux (2.4 和 2.6)、OpenBSD 等系列的客户操作系统。假如你曾经有用过虚拟机软件的经历的话，相信使用 VirtualBox 不在话下。即便你是一个新手，也没有关系。VirtualBox 提供了详细的文档，可以助你在短期内入门。
InnoTek VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software. 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 Public License (GPL). 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.

VirtualBox 1.5.2 (released 2007-10-18)
Windows Installer: fixed installation on Windows 2000 hosts
Windows Installer: proper warning when installing a 32-bit VirtualBox version on 64-bit Windows and vice versa
Linux Installer: no longer require license acceptance during install, instead at first GUI startup (addresses issues with hanging installer on Debian based distributions)
GUI: added user registration dialog
GUI: fixed crashes on 64-bit Linux hosts
GUI: several fixes and improvements to seamless mode
GUI: fixed DirectDraw mode with certain video cards (e.g. Intel i915)
GUI: fixed incorrect guest resolution after leaving fullscreen mode
GUI: improved keyboard handling on Linux host
GUI: show fatal VM aborts (aka "Guru Meditation")
GUI: fixed crashes due to a display update race condition on some systems
GUI: added ACPI shutdown option to the VM close dialog
GUI: NLS improvements
BIOS: fixed floppy boot menu
BIOS: expose the VM UUID in the DMI/SMBIOS area
VGA: fixed CGA video modes
VGA: fixed 8-bit DAC handling (Solaris setup)
VMM: fixed issue with VT-x on Windows 64-bit hosts
VMM: improved compatibility with Linux KVM
VMM: fixed issues with Fedora 8 guests
VMM: fixed fatal errors while installing Windows guests when using AMD-V
VMM: fixed sporadic hangs when minimizing VM window and using VT-x/AMD-V
VMM: fixed high load of ksoftirq on tickless Linux hosts
VMM: fixed Windows 2000 guests hangs related to IRQ sharing
VMM: fixed sporadic errors during openSUSE 10.3 installation
VMM: fixed issue with Linux 2.6.23 guests
VMM: fixed issues with Solaris guests
VMM: fixed stability issue related to incorrect relocations
Serial: significantly reduced CPU utilization
Network: fixed issues with FreeBSD guests
Network: added MII support (100MBit detection fix)
Network: improved MAC address handling
Network: added PXE release logging
IDE: large reads from CD could exceed the I/O buffer size
Audio: load ALSA dynamically on Linux (i.e. do not fail when ALSA is not present)
VRDP: support additional RDP clients (SunRay, WinConnect, Mac OS X)
VRDP: fixed issues when client color depth is higher than server color depth
VRDP: make PAM authentication service name configurable
VRDP: increased stack size to deal with stack consuming PAM library calls
Additions: various fixes and enhancements to clipboard handling
Windows Additions: fixed issues with Additions on NT 4 guests
Windows Additions: added support for 8-bit video modes
Windows Additions: allow specifying custom resolutions for secondary screens
Windows Additions: several fixes and improvements for DirectDraw
Windows Additions: improved the mouse filter driver compatibility with other mouse drivers
Linux Additions: several fixes and enhancements to Shared Folders
Linux Additions: added support for X.org Server 1.4
Shared folders: fixed MS Powerpoint access issues (Linux host)
API: fixed RPC_E_CHANGED_MODE startup error on Windows hosts<
API: fixed SMP race condition on Linux hosts
API: fixed stability issues on Windows hosts in low memory conditions

截图：http://www.virtualbox.org/wiki/Screenshots
更新：http://www.virtualbox.org/wiki/Changelog
官网：http://www.virtualbox.org
~Windows NT 4.0, 2000, XP, Server 2003, Vista~

官方下载：点击这里下载文件
其它平台下载：http://www.virtualbox.org/wiki/Downloads