Around 1991, Berkeley Software Design Inc., began work in BSD/386, the port of 4.3BSD NET/2 (a University's adapted version of AT&T's Unix, but believed to be without any AT&T-owned code) to run on the Intel 80386. It was freed within March 1993. A company sold licenses & trend lines for it, do you need terms in the BSD License which permitted use of the BSD software program inside proprietary systems, every bit hanker when credit was given to the University. A company successively contributed code & resources to the development of non-commercial BSD operating systems.

When a share of the class action settlement of the USL v. BSDi, BSDi substituted code that had been written for the University's 4.4 BSD Lite for disputed code in their OS, effective with version 2.0. A "386" designation wwhen becoming less meaningful, & a models come to exist as referred to as as "BSD/OS" or even "BSDi".

A more & more pinching market for Unix-compatible operating systems in the late 1990s and early 2000s pain sales of BSD/OS. In 1 prevent of a market, it lacked the certification of the Open Group to bear the "UNIX®" trademark, & a sales forces & devices trend lines of the big Unix seller. On a other prevent, it lacked the negligible acquisition dollars and cents of the freely-licensed BSDs. A OS was purchased by Wind River Systems in 2001. Wind Flow of any stream discontinued sales of BSD/OS at a prevent of 2003, using trprevent lines terminated at a end of 2004.