Berkeley Software Distribution or BSD is a flavor of UNIX that was developed at the University of California, Berkeley. Today, the BSD or *BSD systems are free Unix-like operating systems based on the university's distribution. To honor this, these systems put BSD at the end of their names. The *BSD systems are DragonFly BSD, FreeBSD, NetBSD, and OpenBSD.

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  •   FreeBSD: focuses on speed and performance.
  •   Mac OS X: Darwin and BSD
  •   NetBSD: focuses on portability
  •   OpenBSD: focuses on code correctness (and thus security) and easy to security
  •   Historical: BSD operating systems that have been unmaintained or abandoned.

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