The screenshots below show several impressions while running VirtualBox on Windows, Mac OS X and Linux/UNIX platforms:

VirtualBox 5.0 for Mac OS X. Within VirtualBox Fedora 21 is running.

VirtualBox 5.0 for Linux. Within VirtualBox Mint 17.1 is running.

VirtualBox 5.0 for Windows. Within VirtualBox openSUSE 13.2 is running.

VirtualBox 5.0 for Windows. Within VirtualBox Ubuntu 14.04 is running.

VirtualBox 5.0 for Linux. Within VirtualBox Windows 7 is running.

VirtualBox 5.0 for Mac OS X. Within VirtualBox Windows 8.1 is running.

VirtualBox 4.0 for Windows. Within VirtualBox Ubuntu 10.10 is running.

VirtualBox 4.0 for Mac OS X. Within VirtualBox Windows 7 is running.