• VirtualBox
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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.

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, Linux and Solaris. VirtualBox has special software that can be installed inside Windows, Linux and Solaris 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). There are also guest additions for OS/2 with somewhat reduced functionality.

- Shared folders. Like many other virtualization solutions, for easy data exchange between hosts and guests, VirtualBox allows for declaring certain host directories as "shared folders", which can then be accessed from within virtual machines.

- And more
This is a maintenance release. The following items were fixed and/or added:

* VMM: adapted to changes in Mac OS X 10.8.2 (bug #10965)
* GUI: restored VM item tool-tip functionality (4.2 regression)
* GUI: added group item tool-tip functionality
* GUI: fixed handling of the .ova/.ovf file name association (4.2 regression)
* GUI: it was not possible to change any setting before the first VM was created (bug #10928)
* GUI: disable grouping action if all the selected items are full children list of the same group already
* GUI: added menu for runtime drag-and-drop option change
* GUI: cleanup shared-clipboard menu on visual-mode change
* GUI: make sure VM receives keyboard focus on entering fullscreen-mode on Win host (bug #11051)
* GUI: disable proxy authentication for security reasons
* 3D Support: DrawIndexedPrimitiveUP implementation fixes for the Windows WDDM video driver (bug #10929)
* Storage: fixed a release assertion in the AHCI emulation when requests where canceled with asynchronous I/O disabled
* Storage: fixed a hang during VM reset under certain circumstances (bug #10898)
* NAT: fixed a crash under rare circumstances (Windows hosts only; bug #10128)
* NAT: automatically use the host resolver if the host name server is set to some unusual loopback value (bug #10864)
* E1000: fixed a VirtualBox crash during intensive network transfers (4.2 regression; bugs #10936, #10969, #10980)
* ICH9: fixed PCI bridge initialization
* USB mouse: ensure that the last mouse event doesn't get lost if no URBs are available
* BIOS: certain legacy guests (e.g. Windows 95) didn't find the boot device after a warm reboot
* BIOS: don't trash the palette in text modes when setting the border color
* EFI: fixed OS X guest autoboot (4.2 regression)
* VBoxManage: fixed output of showvminfo --machinereadable (bug #10973)
* VBoxManage: fixed parsing of storageattach --discard (bug #11023)
* VBoxManage: fixed wrong output of the HPET setting in showvminfo (bug #11065)
* VBoxManage: fixed closing the guest session after executing a guest process via guest control
* VBoxShell: adaptions to interface name changes
* Guest Additions device: fixed a Guest Additions hang when a machine was reset after a crash
* Linux hosts / guests: Linux 3.7-rc1 fixes
* Linux Additions: support X.Org Server 1.13
* Linux Additions: fixed a hang when the X server was restarted with old guest kernels
* Linux Additions: fixed a VBoxService crash during CPU hot remove (bug #10964)
Windows Additions: fixed automatic screen resize issue for NT4 guests
* OS/2 Additions: fixed shutdown hang
* OS/2 Additions: fixed mouse driver panic
* Solaris hosts: fixed autostart service going into maintenance mode after all VMs started
* Solaris hosts: fixed linking the host driver with the dtrace module
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