BSD

Berkeley Software Distribution (BSD) - University of California Berkeley (UCB)

History
PDP-11
 * BSD (1977)
 * 2BSD (1978)
 * 2.8BSD (1981)
 * 2.9BSD (1983)
 * 2.10.1BSD (Jan 1989)
 * 2.11BSD (1992) - backports from 4.3BSD

VAX
 * 3BSD (1979)
 * 4BSD (1980)
 * 4.1BSD
 * 4.2BSD (1983)
 * 4.3BSD (1986) - TCP/IP
 * 4.3BSD-Tahoe (1988)
 * 4.3BSD-Net/1
 * 4.3BSD-Net/2
 * 4.4BSD-Lite (1994)
 * 4.4BSD-Lite2 (1995)

Berkeley Software Design, Inc. (BSDI)
 * BSD/386 (1993)
 * BSD/OS 2.0 (Jan 1995)


 * MORE/BSD (HP 68k Workstations)
 * SunOS
 * 386BSD - Historical - Used as the basis for FreeBSD, NetBSD and OpenBSD
 * FreeBSD
 * AskoziaPBX (Defunct)
 * PacBSD (aka archBSD - Defunct)
 * NetBSD
 * EdgeBSD
 * OpenBSD
 * Bitrig