Unix Flavors List

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Unix is not a single operating system. It has many flavors (aka. variants, types, or implementations). Although based on a core set of Unix commands, different flavors have their own unique commands and features, and designed to work with different types of hardware. No one knows exactly how many Unix flavors are there, but it is safe to say that if including all those that are obscure and obsolete, the number of Unix flavors is at least in the hundreds.

You can often tell that an operating system is in the Unix family if it has a name that is a combination of the letters U, I, and X.

The following is some of the well-known Unix flavors, with links to their official home pages.

BSD/OS (BSDi) by Wind River
CLIX by Intergraph Corp.
Debian GNU/Linux by Software in the Public Interest, Inc. 
Tru64 Unix (formerly Digital Unix) by Compaq Computer Corp. 
DYNIX/ptx by IBM (formerly by Sequent Computer Systems)
Esix Unix Esix Systems 
FreeBSD by FreeBSD Group 
GNU Herd by GNU Organization 
HAL SPARC64/OS by HAL Computer Systems, Inc. 
HP-UX by Hewlett-Packard Company 
Irix by Silicon Graphics, Inc. 
Linux by several groups several 
LynxOS by Lynx Real-Time Systems, Inc. 
MacOS X Server by Apple Computer, Inc. 
NetBSD by NetBSD Group 
NonStop-UX by Compaq Computer Corporation 
OpenBSD by OpenBSD Group 
OpenLinux by Caldera Systems, Inc. 
Openstep by Apple Computer, Inc.

Red Hat Linux by Red Hat Software, Inc. 
Reliant Unix by Siemens AG 
SCO Unix by The Santa Cruz Operation Inc. 
Solaris by Sun Microsystems 
SuSE by S.u.S.E., Inc. 
UNICOS by Silicon Graphics, Inc. 
UTS by UTS Global, LLC