For the Official Apple Developer Page, see Apple Open Source.īSD's traditionally use the Ports system for Package Management. For the Open Source Project, see PureDarwin. And now we're back to Bullet #1, as Darwin is a closed source fork of BSD. OS X is the Darwin OS + the NeXT Desktop Environment.

In 1977, for $90, Bob Fabry and others, compiled/built the first versions of BSD, short for Berkeley Systems Distribution.These answers are half correct, because virtualization is a choice but there is another.