Proprietary
Acorn
Amiga
Apple/Macintosh
Array Networks
Atari ST
Burroughs (later Unisys)
Convergent Technologies
Later acquired by Unisys.
Be Incorporated
Digital/Tandem Computers/Compaq/HP
- AIS
- OS/8
- ITS (for the PDP-6 and PDP-10)
- MPE (from HP)
- TOPS-10 (for the PDP-10)
- WAITS
- TENEX (from BBN)
- TOPS-20 (for the PDP-10)
- RSTS/E (ran on several machines, chiefly PDP-11s)
- RSX-11 (multiuser, multitasking OS for PDP-11s)
- RT-11 (single user OS for PDP-11)
- DSM-11 DEC Standard MUMPS
- VMS (by DEC for the VAX mini-computer range; later renamed OpenVMS)
- Domain/OS (originally Aegis, from Apollo Computer who were bought by HP)
- HP-UX
- Ultrix
- Digital UNIX (derived from OSF/1, and which became HP's Tru64)
IBM
IBM has also contributed a significant amount of code to the open source operating system Linux (below).
Microsoft
Non-Standard Language
- Symbolics Genera written in a systems dialect of the Lisp programming language called ZetaLisp, for this reason referred to as Lisp machines.
- Texas Instruments' Explorer Lisp machine workstations also had systems code written in Lisp Machine Lisp.
- The Mesa programming language was used to implement some (all?) systems code in Xerox Star workstations.
Other
- Desqview, allows running multiple copies of DOS concurrently on one machine.
- EOS (Operating System), developed by ETA Systems for use in their ETA-10 line of supercomputers
- GCOS is a proprietary Operating System originally developed by General Electric
- GOS (Galaxy Operating System) is a new operating system being developed by Galaxy Productions
- NCR IRX - operating system used by NCR I-9040 series
- SINTRAN III - an operating system used with Norsk Data computers.
- THEOS, THEOS Software Corporation
- TinyOS
- TRS-DOS A floppy-disk-oriented OS supplied by Tandy/Radio Shack for their Z80-based line of personal computers.
- TX/4 and DX/10 - proprietary operating systems for TI 990 minicomputers
- MAI Basic Four - An OS implementing Business Basic from MAI Systems.
- Michigan Terminal System - Developed by a group of American universities for IBM 360 series mainframes
Other proprietary Unix-like and POSIX-compliant systems
- Aegis (Apollo Computer)
- Amiga Unix (Amiga ports of Unix System V release 3.2 with Amiga A2500UX and SVR4 with Amiga A3000UX. Started in 1989, last version was in 1992)
- Clix (Intergraph's System V implementation)
- Cromix (Unix-like OS from Cromemco)
- Coherent (Unix-like OS from Mark Williams Co. for PC class computers)
- DNIX
- Idris workalike from Whitesmiths
- IRIX from SGI
- iMAX developed (in Ada) for the Intel iAPX-432 object-capability based 32-bit microprocessoriAPX-432.
- Mac OS X from Apple Computer
- NeXTSTEP (developed by NeXT; a Unix-based OS based on the Mach microkernel)
- OS-9 Unix-like RTOS. (OS from Microware for Motorola 6809 based microcomputers)
- OS-9/68k (Unix emulating OS from Microware for Motorola 680x0 based computers; developed from OS-9)
- OS-9000 (portable Unix emulating OS from Microware; one implementation was for Intel x86)
- OSF/1 (developed into a commercial offering by Digital Equipment Corporation)
- OPENSTEP
- QNX (POSIX, microkernel OS; usually a real time embedded OS)
- Rhapsody
- RISC/os (a port by MIPS of 4.3BSD to the MIPS RISC architecture)
- RMX
- SCO UNIX (from SCO, bought by Caldera who re-renamed themselves SCO Group)
- SINIX (a port by SNI of Unix to the MIPS RISC architecture)
- Solaris (Sun's System V-based replacement for SunOS)
- SunOS (BSD-based Unix system used on early Sun hardware)
- System V (a release of AT&T Unix, 'SVR4' was the 4th minor release)
- System V/AT, 386 (The first version of AT&T System V UNIX on the IBM 286 and 386 PCs, ported and sold by Microport)
- UniFlex (Unix emulating OS by TSC for DMA-capable, extended addresses, Mototola 6809 based computers; eg SWTPC, GIMIX, ...)
- Unicos (the version of Unix designed for Cray Supercomputers, mainly geared to vector calculations)
- MUSIC/SP (an operating system developed for the S/370, running normally under VM)
- SkyOS (developed by Robert Szeleney)
- DG/UX (Data General Corp)
UNIVAC (later Unisys)
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