As more and more people began developing Unix, the more they wanted their own
implementations. Disagreement among how things should work no doubt lead to
small groups branching off to create their own version of Unix. Rather than
fighting over the design of the operating system, these individuals simply
started their own projects. This was made possible because of the idea of open
AIX IBM RISC
AIX is created and developed by IBM, primarily for their own hardware. Even among unix flavors, many administrators consider AIX to be quite different than the others.
From the Unix FAQ: But I hear Apple has decided to drop A/UX (will go for AIX now that they're together with IBM on the PPC).
From the BSDI web page: BSDI is the commercial supplier of the BSD/OS originally developed at the University of California, Berkeley. We concentrate on delivering and supporting robust, stable BSD/OS powered internet server software wherever cost effective, reliable and high performance solutions are required.
FreeBSD is the most popular free derivative of the BSD line of Unix. On top of being powerful and robust, it is open source and very stable.
HP-UX Hewlett-Packard HP (CISC/RISC)
Created by Hewlett Packard, HP-UX is designed for their own line of hardware. HP-UX is a commercial version of Unix designed for high end business applications.
IRIX SGI SGI
Silicon Graphics created IRIX for their own line of hardware. Well known for their powerful graphics ability, IRIX/SGI can be found developing many of the special affects found in movies today.
Linux - x86/Sparc/more
Linux is probably the most commonly used flavor of Unix out there today. Like the term 'Unix', 'Linux' has now come to mean any one of a number of distributions.
Minix is an older but stable flavor of Unix able to be run on systems with small hard drives. For older computers lacking power, this may be a great option.
NetBSD NetBSD(almost any hardware)
From the NetBSD page: The NetBSD Project is a collective volunteer effort to produce a freely available and redistributable UNIX-like operating system. NetBSD runs on a broad range of hardware platforms and is highly portable. It comes with complete source code, and is user-supported.
NeXT is a little known about and little used Unix flavor that is akin to IRIX in that it is graphic heavy. Often found on NeXT hardware, these machines are a lot of fun to play with and strong with multimedia.
OpenBSD is a spin-off of the Net/FreeBSD projects. The primary focus seems to be security more than anything.
OSF/1 DEC DEC
Now (apparently) called 'Tru64 Unix', OSF/1 is a high end 64 bit version of Unix geared toward large servers and companies.
Solaris Sun x86/Sparc
Solaris is Sun's version of Unix being developed today. Based on SVR4 rather than BSD (as SunOS was), Solaris is one of the more widely used flavors of Unix in enterprise networks. Solaris is often used and found on older Sun hardware for hobbyists as well. Solaris source code is now available.
SunOS Sun Sparc/i386
No longer being developed, SunOS is Sun's previous iteration of Unix based on BSD. Designed for Sun hardware only, it provides a stable and fairly well supported platform for companies and individuals alike.
Unixware (aka SCO) is a fairly old and infrequently used OS that is gaining a bit more popularity in recent years.
Ultrix DEC x86/more
One of DEC's older flavors of Unix, it is no longer being developed in favor of 'Tru64 Unix'.
Unicos is the primary operating system found on Cray super computers. Now owned by SGI, Unicos continues to serve SGI's continued development on the Cray computers.
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