BSD-Day 2012
The Berkeley Software Distribution (BSD) is a free open source version of the Unix operating system which evolved at the University of Berkeley starting from 1975, and it is based on AT&T's Unix Sixth Edition (V6). The name BSD is now used collectively for the modern descendants of these distributions. Most notable among these today is perhaps the major open source BSDs (FreeBSD, NetBSD, OpenBSD) which have themselves spawned a number of children. They are targeted at an array of systems for different purposes and are common in government facilities, universities and in commercial use. A number of commercial operating systems are also partly or wholly based on BSD or its descendants, including Apple Computer's Mac OS X.