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Flavors of UNIX

 The table below summarizes some of the common UNIX variants and clones. While the table lists about forty different variants, the UNIX world isn't nearly as diverse as it used to be. Some of them are defunct and are listed for historical purposes. Others are on their way out. In some cases, vendors have defected to Microsoft technology. In others, mergers and acquisitions have led to the consolidation of different UNIX implementations. A list of "dead" UNIX implementations would be substantial indeed, consisting of hundreds of variations on the letters "U," "I," and "X" (CLIX, CX/UX, MV/UX, SINIX, VENIX, etc.).

UNIX Variants and Clones
 
UNIX Variant
Company/Org.
For More Info
A/UX
Apple Computer, Inc.
defunct
AIX
IBM
http://www.rs6000.ibm.com/
software/
AT&T System V
AT&T
defunct
BS2000/OSD-BC
Siemens AG
http://www.siemens.com/
servers/bs2osd/
BSD/OS
Berkeley Software Design, Inc.
http://www.bsdi.com
CLIX
Intergraph Corp.
http://www.intergraph.com
Debian GNU/Hurd
Software in the Public Interest, Inc.
http://www.gnu.org/
software/hurd/debian-
gnu-hurd.html
Debian GNU/Linux
Software in the Public Interest, Inc.
http://www.debian.org
DG/UX
Data General Corp.
http://www.dg.com/
products/html/dg_ux.html
Digital Unix
Compaq Computer Corporation
http://www.unix.digital.com/
DYNIX/ptx
Sequent Computer Systems, Inc.
http://www.sequent.com/
products/software/
operatingsys/dynix.html
Esix UNIX
Esix Systems
http://www.esix.com/
FreeBSD
FreeBSD group
http://www.freebsd.org
GNU Herd
GNU organization
http://www.gnu.org
HAL SPARC64/OS
HAL Computer Systems, Inc.
http://www.hal.com
HP-UX
Hewlett-Packard Company
http://www.hp.com/
unixwork/hpux/
Irix
Silicon Graphics, Inc.
http://www.sgi.com/
software/irix6.5/
Linux
several
http://www.linux.org
LynxOS
Lynx Real-Time Systems, Inc.
http://www.lynx.com/
products/lynxos.html
MachTen
Tenon Intersystems
http://www.tenon.com/
products/machten/
MacOS X Server
Apple Computer, Inc.
http://www.apple.com/macosx/
Minix
none
http://www.cs.vu.nl/~ast/
minix.html
MkLinux
Apple Computer, Inc.
http://www.mklinux.apple.com
NCR UNIX SVR4 MP-RAS
NCR Corporation
http://www3.ncr.com/
product/integrated/
software/p2.unix.html
NetBSD
NetBSD group
http://www.netbsd.org
NeXTSTEP
NeXT Computer Inc.
defunct, see http://www.apple.com/
enterprise/
NonStop-UX
Compaq Computer Corporation
http://www.tandem.com
OpenBSD
OpenBSD group
http://www.openbsd.org
OpenLinux
Caldera Systems, Inc.
http://www.calderasystems.com
Openstep
Apple Computer, Inc.
http://www.apple.com/
enterprise/
QNX Realtime OS
QNX Software Systems Ltd.
http://www.qnx.com/
products/os/qnxrtos.html
Red Hat Linux
Red Hat Software, Inc.
http://www.redhat.com/
Reliant UNIX
Siemens AG
http://www.siemens.com/
servers/rm/
Solaris
Sun Microsystems
http://www.sun.com/
software/solaris/
SunOS
Sun Microsystems
defunct
SuSE
S.u.S.E., Inc.
http://www.suse.com
UNICOS
Silicon Graphics, Inc.
http://www.sgi.com/software/
unicos/
UnixWare
SCO -- The Santa Cruz Operation Inc.
http://www.sco.com/unix/
UTS
Amdahl Corporation
http://www.amdahl.com/uts/
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