This website deals mostly with FreeBSD and systems derived from or based on this superb operating system. However it’s also good to be aware of other BSD systems that are around and the reason why they exist or why have been developed: OpenBSD (secure by default – the world’s most secure OS), NetBSD (runs on nearly every platform imaginable, including a bread toaster! and in some sense Apple’s MacOS X. (See Unix family tree here)

There’s a good article on explaining the history, the differences between and common features of the 4 main BSD systems.

Organizations that want to use a public Unix variant have two solutions from which to chose: Linux and BSD. The much talked about Linux camp contains a variety of distributions that include different utilities and tool sets. The same is true of the less frequently covered BSD camp. This article compares and contrasts the four main BSD variants and offers recommendations for both server- and desktop-based solutions.

There are four main BSD variants. Three of these (FreeBSD, OpenBSD, and NetBSD) are totally free; the fourth (Mac OS X) is technically the core part of an operating system that most wouldn’t even consider a BSD variant. To understand the differences between the various versions, let’s briefly recap the history of BSD to understand how the different versions have developed.

Read the whole article here.