VirtualBox is an Open Source virtualization solution similar to Parallels and Fusion that I used as my primary VM solution around 2011 simply because a) it was available on pretty much all OSes I deal with and b) it was easier to install than Fusion (simply because VMware took a while to understand that their downloads section was a hassle). To be honest I don’t like it much, but it worked - plus it was quite popular, and you can’t beat free. Useful Resources phpVirtualBox is a great, nearly ful...