386BSD

386BSD, sometimes called "Jolix", was a free Unix-like operating system based on BSD, first released in 1992. It ran on PC-compatible computer systems based on the Intel 80386 microprocessor. 386BSD innovations include role-based security, ring buffers, self-ordered configuration and modular kernel design.

Read more about 386BSD:  History, Release 1.0, Relationship With BSD/386, Copyright and Use of The Code