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.
VMM: reset the TSC on VM reset to work around a Windows bug.
Audio: fixed memory leak when enabled with VRDP connections (5.1.24 regression).
Audio: fixed creation of too many sound sinks on Linux hosts when using the PulseAudio backend.
Audio: implemented record gain registers for AC'97 emulation; those are needed for newer Ubuntu guests which rely on those when controlling gain and muting the recording (capturing) levels.
Storage: fixed hang when using the emulated NVMe controller with the SPDK.
Mouse: double click was not working with a precision touchpad.
Linux hosts: properly bring up host-only network interfaces with iproute (5.1.24 regression).
Linux hosts: provide Python 3 libraries for deb/rpm packages.
Windows hosts: make it possible to use host-only networking without having bridged networking installed.
Windows guests: fixed automatic logons for Vista and newer Windows guests (5.1.24 regression).