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NetBSD is a freely redistributable, open source version of the Unix-derivative Berkeley Software Distribution (BSD) computer operating system. It was the second open source BSD descendant to be formally released, after 386BSD, and continues to be actively developed.
The Berkeley Software Distribution [a] (BSD), also known as Berkeley Unix or BSD Unix, is a discontinued Unix operating system developed and distributed by the Computer Systems Research Group (CSRG) at the University of California, Berkeley, beginning in 1978.
There are a number of Unix-like operating systems based on or descended from the Berkeley Software Distribution (BSD) series of Unix variant options. The three most notable descendants in current use are FreeBSD, OpenBSD, and NetBSD, which are all derived from 386BSD and 4.4BSD-Lite, by various routes.
BSD, Unix-like 7.0 OpenBSD DragonFly BSD: BSD Hybrid: C 1:1 BSD, Unix-like No ... Operating system Mandatory access control Software executable space protection
FreeBSD is a free-software Unix-like operating system descended from the Berkeley Software Distribution (BSD). The first version was released in 1993 developed from 386BSD [3] —the first fully functional and free Unix clone—and has since continuously been the most commonly used BSD-derived operating system.
A selection of significant Unix versions and Unix-like operating systems that descend from BSD includes: FreeBSD, an open source general purpose operating system. Orbis OS, Sony's fork of FreeBSD 9 is the operating system for the PS4. CellOS for the PS3 system is believed to also be a FreeBSD fork, and is known to contain FreeBSD and NetBSD code
Below are other certified Unix operating systems: [4] macOS: Heavily based on BSD, macOS is registered as certified Unix 03 brand on both versions (Intel and Apple silicon-based). SCO OpenServer: Another operating system by SCO. Registered as Unix 93 “single and Multi-processor Industry Standard Intel architecture platform”.
NetBSD is a free and open-source Unix-like operating system based on the Berkeley Software Distribution (BSD). It was the first open-source BSD descendant officially released after 386BSD was forked .