Berkeley Software Distribution

Berkeley Software Distribution (BSD) is a kind of the UNIX operating system that is distributed for free since 1989. It was started by people in Berkeley, California, USA in the year 1977. Now, people from around the world work on it.

There are many different kinds of BSD that many people have worked on. Some of them are DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and Mac OS X.

The system software for PlayStation 3 is made from BSD. So is the system software for PlayStation 4.

Berkeley Software Distribution Media

Simplified evolution of Unix systems. Not shown are Junos, PlayStation 3 system software and other proprietary forks.
The VAX-11/780, a typical minicomputer used for early BSD timesharing systems
"4.3 BSD UNIX" from the University of Wisconsin circa 1987. System startup and login.
4.3 BSD from the University of Wisconsin. Displaying the man page for Franz Lisp.
Tape for SunOS 4.1.1, a 4.3BSD derivative
Sony NEWS workstation running the BSD-based NEWS-OS operating system

Other websites

DragonFly BSD homepage
FreeBSD homepage
NetBSD homepage
OpenBSD homepage

This short article about technology can be made longer. You can help Wikipedia by adding to it.