Oracle VM VirtualBox allows users to run nearly any operating system on a single machine and to freely switch between OS instances running simultaneously. VirtualBox is a general-purpose full virtualizer for x86 and AMD64/Intel64 hardware, targeted at server, desktop and embedded 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.
Features of Oracle VM VirtualBox are:
Paravirtualization support for modern Windows and Linux guests
Oracle VM Virtual Box is able to expose a paravirtualization interface to facilitate accurate and efficient execution of software. Once the virtual machine platform is defined, Oracle VM Virtual Box improves guest OS performances by leveraging built-in virtualization support.
xHCI controller to support USB 3.0 devices
Guest operating systems are now able to directly recognize USB 3.0 devices and operate at full 3.0 speeds. Guest can now be configured to use USB 1.1, 2.0 and 3.0 devices.
Improved Drag & Drop support
Starting from Oracle VM VirtualBox 5.0 improved the support of a bi-directional drag&drop between guest and host operating system; drag and drop support is available with latest guest-additions installed.
Disk image encryption
Oracle VM VirtualBox 5.0 allows for encrypted virtual disk images by leveraging AES algorithm in XTS mode (128-bit or 256-bit); since the DEK is stored as part of the virtual machine configuration file, encryption introduces a further security feature that will ask for a password while starting the virtual machine.
Headless and Detachable start options
Oracle VM VirtualBox now supports starting virtual machines in the background with a separate front-end process that can be closed while the virtual machine continues to work.