VirtualBox 1.6.6

InnoTek VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. 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). See "About VirtualBox" for an introduction; see "InnoTek" for more about our company.

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 is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while InnoTek ensures the product always meets professional quality criteria.

Changelog:

• VMM: fixed excessive logging (bug #1901)
• VMM: AMD-V stability fixes (bug #1685)
• GUI: added support for Ctrl+Caps reversed keyboards (bug #1891)
• SATA: fixed BSODs of Windows guests on a SATA disk (bug #1941)
• SATA: fixed hard disk detection on Solaris 10 U5 (bug #1789)
• VBoxHeadless: don’t start the clipboard service (bug #1743)
• VBoxHeadless: added -vrdp parameter which allows to start the VM session without VRDP (bug #1960)
• VBoxManage: fixes to creating raw disk/partition VMDK files, now accepts removable media on Windows (bug #1869)
• VRDP: fixed communication with MS Remote Resktop Connection on MacOS X (bug #1337)
• VRDP: clipboard fixes (bug #1410)
• VRDP: fixed crash during PAM authentication (bug #1953)
• Shared Folders: fixed a regression introduced in version 1.6.2: the shared folders service was sometimes not properly installed (Windows guests only, bug #1915)
• Shared Folders: don’t deny to load a VM if a shared folder is not accessible (bug #822)
• BIOS: allow to specify empty DMI strings (bug #1957)
• OSE archive: added missing Makefiles (bug #1912)
• Linux hosts: workaround for buggy gcc-4.3 compilers (e.g. openSUSE 11)
• Linux hosts: one more fix for compiling the kernel modules on Linux 2.6.27 (bug #1962)
• MacOS X hosts: shared folders unicode fix
• Solaris hosts: fixed link issue (bug #1840)
• Windows additions: allow to downgrade the package
• Windows additions: fixed corrupted installer icon on Windows 2000 (bug #1486)
• Windows additions: fixed bug when creating intermediate directories (bug #1870)
• Windows additions: implemented /xres=, /yres= and /depth= switches for the installer (bug #1990)
• Linux additions: properly unregister the misc device when unloading the kernel module
• Linux additions: fixed startup order for recent Linux distributions again (e.g. openSUSE 11)
• Linux additions: attempt to fix the autostart issue of !VBoxClient with Mandriva guests (bug #1699)
• Linux additions: fixed detection of patched Linux 2.6.18 kernels of RHEL5 / FC6 / CentOS 5.2 (bugs #1899, #1973)
• Linux additions: added new mount flags dmode, fmode, umask, dmask and fmask allowing to override the file mode (bug #1776)
• Documentation: added a note that jumbo frames don’t work (bug #1877)
• Documentation: document special host interface names on openSUSE11 (bug #1892)

This is a very good alternative to VMware Workstation. Although comparatively it lacks a LOT of features, it's the best free virtual machine you can get.  User Manual (current development snapshot, updated 2008-06-06)