VirtualBox is a full virtualizer available on macOS, Windows, and Linux. When you install an operating system in VirtualBox, you're not dual-booting the new OS alongside the original one.

VirtualBox is now available for Apple Silicon-based Macs, although with spotty x86 support. Here's how to use it.

VirtualBox 3.2 beta is a free download for Windows, Mac, and Linux systems. If you already know of some neat and, shall we say, unofficial OS X work-arounds that make use of VirtualBox, tell us ...