386BSD
A/UX - Apple Corporation
AIX - International Business Machines (IBM)
ArchBSD - 4.4 BSD for Acorn RISC Platforms
AT&T System III
AT&T System V
AT&T 3B2
BTOS
BSD/OS - Berkeley Software Design, Inc.
CLIX - Intergraph Corp.
Coherent
CTIX
Darwin
DC/OSx - Pyramid
DELPHI
DG/UX - Data General
Digital Unix (OSF1)(TRU64) - Digital Equiptment Corp. (DEC)
Domain/OS
DSR/NX
Dynix - IBM's enhanced enterprise class operating system.
ESIX - Esix Systems
FreeBSD - FreeBSD Organization
FreeBSD/Arm - 4.4 BSD for the Acorn RISC Platforms
HP-UX - Hewlett Packard (HP)
Harris' CX/UX
Helios
HEP-UPX
Hurd - GNU
IDRIS
Interactive Unix - Sun Microsystems
Irix - Silicon Graphics (SGI)
Linux
LynxOS - Lynx Real-Time System Inc.
Lunix - Little UNIX for C64
MachTen - Tenon Intersystems
MacOS X
Minix
Motorola Unix R40
Motorola Unix V/88
MV/UX - Data General
NCR SVR4 MP-RAS - NCR Corporation
NetBSD
NeXT/OPENSTEP
NonStop-UX - Tandem
OpenBSD
OS/MP - (Solbournes - Operating System/Multi-Processing
POSIX
PTX (Sequent)
QNX - QNX Software Systems Ltd.
Reliant Unix - Fujitsu Siemens Computer
Riscos
RT - Encore (Real Time Unix)
SCO ODT - Santa Cruz Operation
SCO Open Server - Santa Cruz Operation
SCO XENIX - Santa Cruz Operation
SINIX - Siemens/Nixdorf
Solaris - Sun Microsystems
SPARC64/OS
SPP-UX - Convex
Stellar(?) (Stardent)
SunOS - Sun Microsystems
Topix - Sequoias Enterprise Systems
TRU64 (DUNIX) - Digital Equiptment Corp./Compaq
Ultrix - Digital Equiptment Corp. (DEC)
UMAX V R/T
UNICOS - Cray Research
UniSoft - One of the first widely-used commercial UNIX ports.
Unixware/Univel - Novell and Unix Systems Laboratories
USG
UTS - Amdahl Corporation
VENIX - VenturCom, Inc.
Version 5
Version 6
Version 7
Windows 95/98/NT/ME/2000/XP
Xenix