List of operating systems

This is a list of operating systems. Computer operating systems can be categorized by technology, ownership, licensing, working state, usage, and by many other characteristics. In practice, many of these groupings may overlap. Criteria for inclusion is notability, as shown either through an existing Wikipedia article or citation to a reliable source.

Proprietary

Acorn Computers

Arthur
ARX
MOS
RISC iX
RISC OS
Amiga Inc.
AmigaOS
*AmigaOS 1.0-3.9
* AmigaOS 4
Amiga Unix
Amstrad
AMSDOS
Contiki
CP/M 2.2
CP/M Plus
SymbOS
Apple Inc.
Apple II family
* Apple DOS
* Apple Pascal
* ProDOS
* GS/OS
* GNO/ME
*Contiki
Apple III
* Apple SOS
Apple Lisa
Apple Macintosh
* Classic Mac OS
* A/UX
* Copland
* MkLinux
* Pink
* Rhapsody
* macOS
** macOS Server
Apple Network Server
* IBM AIX
Apple MessagePad
* Newton OS
iPhone and iPod Touch
*iOS
iPad
*iPadOS
Apple Watch
* watchOS
Apple TV
* tvOS
Embedded operating systems
* A/ROSE
* iPod software
* Unnamed NetBSD variant for Airport Extreme and Time Capsule
Apollo Computer
Domain/OS – One of the first network-based systems. Run on Apollo/Domain hardware. Later bought by Hewlett-Packard.
Atari
Atari DOS
Atari TOS
Atari MultiTOS
Contiki
BAE Systems
XTS-400
Be Inc.
BeOS
* BeIA
* BeOS r5.1d0
** magnussoft ZETA
Bell Labs
Unix
* UNIX Time-Sharing System v1
* UNIX Time-Sharing System v2
* UNIX Time-Sharing System v3
* UNIX Time-Sharing System v4
* UNIX Time-Sharing System v5
* UNIX Time-Sharing System v6
** MINI-UNIX
** PWB/UNIX
*** USG
**** CB Unix
* UNIX Time-Sharing System v7
** Unix System III
** Unix System IV
** Unix System V
*** Unix System V Releases 2.0, 3.0, 3.2, 4.0, and 4.2
* UNIX Time-Sharing System v8
* UNIX TIme-Sharing System v9
* UNIX Time-Sharing System v10

Non-Unix Operating Systems:

BESYS
Plan 9 from Bell Labs
Inferno
Burroughs Corporation, Unisys
Burroughs MCP
Commodore International
GEOS
*AmigaOS
**AROS Research Operating System
***Geoworks
Control Data Corporation
Chippewa Operating System
* MACE
** Kronos
*** NOS
**** NOS/BE NOS Batch Environment
**** NOS/VE NOS Virtual Environment
* SCOPE
* SIPROS
EP/IX
Convergent Technologies
Convergent Technologies Operating System – later acquired by Unisys
Cromemco
Cromemco DOS – a Disk Operating system compatible with CP/M
Cromix – a multitasking, multi-user, Unix-like OS for Cromemco microcomputers with Z80A and/or 68000 CPU
Data General
AOS for 16-bit Data General Eclipse computers and AOS/VS for 32-bit Eclipses, MP/AOS for microNOVA-based computers
DG/UX
RDOS Real-time Disk Operating System, with variants: RTOS and DOS
Datapoint
CTOS Cassette Tape Operating System for the Datapoint 2200
DOS Disk Operating System for the Datapoint 2200, 5500, and 1100
DDC-I, Inc.
Deos – Time & Space Partitioned RTOS, Certified to DO-178B, Level A since 1998
HeartOS – POSIX-based Hard Real-Time Operating System
Digital Research, Inc.
CP/M
* CP/M CP/M for Intel 8080/8085 and Zilog Z80
** Personal CP/M, a refinement of CP/M
** CP/M Plus with BDOS 3.0
* CP/M-68K CP/M for Motorola 68000
* CP/M-8000 CP/M for Zilog Z8000
* CP/M-86 CP/M for Intel 8088/8086
** CP/M-86 Plus
** Personal CP/M-86
* MP/M Multi-user version of CP/M-80
** MP/M II
* MP/M-86 Multi-user version of CP/M-86
** MP/M 8-16, a dual-processor variant of MP/M for 8086 and 8080 CPUs.
* Concurrent CP/M, the successor of CP/M-80 and MP/M-80
* Concurrent CP/M-86, the successor of CP/M-86 and MP/M-86
** Concurrent CP/M 8-16, a dual-processor variant of Concurrent CP/M for 8086 and 8080 CPUs.
* Concurrent CP/M-68K, a variant for the 68000
DOS
* Concurrent DOS, the successor of Concurrent CP/M-86 with PC-MODE
** Concurrent PC DOS, a Concurrent DOS variant for IBM compatible PCs
** Concurrent DOS 8-16, a dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs
** Concurrent DOS 286
** Concurrent DOS XM, a real-mode variant of Concurrent DOS with EEMS support
** Concurrent DOS 386
*** Concurrent DOS 386/MGE, a Concurrent DOS 386 variant with advanced graphics terminal capabilities
* Concurrent DOS 68K, a port of Concurrent DOS to Motorola 68000 CPUs with DOS source code portability capabilities
* FlexOS 1.0 – 2.34, a derivative of Concurrent DOS 286
** FlexOS 186, a variant of FlexOS for terminals
** FlexOS 286, a variant of FlexOS for hosts
*** Siemens S5-DOS/MT, an industrial control system based on FlexOS
*** IBM 4680 OS, a POS operating system based on FlexOS
*** IBM 4690 OS, a POS operating system based on FlexOS
**** Toshiba 4690 OS, a POS operating system based on IBM 4690 OS and FlexOS
** FlexOS 386, a later variant of FlexOS for hosts
*** IBM 4690 OS, a POS operating system based on FlexOS
**** Toshiba 4690 OS, a POS operating system based on IBM 4690 OS and FlexOS
** FlexOS 68K, a derivative of Concurrent DOS 68K
* Multiuser DOS, the successor of Concurrent DOS 386
** CCI Multiuser DOS
** Datapac Multiuser DOS
*** Datapac System Manager, a derivative of Datapac Multiuser DOS
** IMS Multiuser DOS
*** IMS REAL/32, a derivative of Multiuser DOS
**** IMS REAL/NG, the successor of REAL/32
* DOS Plus 1.1 – 2.1, a single-user, multi-tasking system derived from Concurrent DOS 4.1 – 5.0
* DR-DOS 3.31 – 6.0, a single-user, single-tasking native DOS derived from Concurrent DOS 6.0
** Novell PalmDOS 1.0
** Novell "Star Trek"
** Novell DOS 7, a single-user, multi-tasking system derived from DR DOS
** Caldera OpenDOS 7.01
** Caldera DR-DOS 7.02 and higher
Digital Equipment Corporation, Tandem Computers, Compaq, Hewlett-Packard
Batch-11/DOS-11
Domain/OS – originally Aegis, from Apollo Computer who were bought by HP
HP-UX
Multi-Programming Executive – from HP
NonStop
OS/8
RSTS/E – multi-user time-sharing OS for PDP-11s
RSX-11 – multiuser, multitasking OS for PDP-11s
RT-11 – single user OS for PDP-11
TOPS-10 – for the PDP-10
TENEX – an ancestor of TOPS-20 from BBN, for the PDP-10
TOPS-20 – for the PDP-10
Digital UNIX – derived from OSF/1, became HP's Tru64 UNIX
Ultrix
VMS – originally by DEC and HP now by VMS Software Inc.) for the VAX mini-computer range, Alpha and Intel Itanium i2 and i4; later renamed OpenVMS
WAITS – for the PDP-6 and PDP-10
ENEA AB
OSE – Flexible, small footprint, high-performance RTOS for control processors
Fujitsu
Towns OS
XSP
OS/IV
MSP
MSP-EX
General Electric, Honeywell, Bull
Real-Time Multiprogramming Operating System
GCOS
Multics
Google
Chromium OS is an open source operating system development version of Chrome OS. Both operating systems are based on the Linux kernel.
* Chrome OS is designed to work exclusively with web applications. Announced on July 7, 2009, Chrome OS is currently publicly available and was released summer 2011. The Chrome OS source code was released on November 19, 2009, under the BSD license as Chromium OS.
* Container-Optimized OS is an operating system that is optimized for running Docker containers, based on Chromium OS
Android is an operating system for mobile devices. It consists of Android Runtime with Linux, with its Linux kernel modified to add drivers for mobile device hardware and to remove unused Vanilla Linux drivers.
gLinux, a Linux distribution that Google uses internally
Fuchsia is a capability-based, real-time, operating system scalable to universal devices, in early development, from the tiniest embedded hardware, wristwatches, tablets to the largest personal computers. Unlike Chrome OS and Android, it is not based on the Linux kernel, but instead began on a new microkernel called "Zircon", derived from "Little Kernel".
Green Hills Software
INTEGRITY – Reliable Operating system
INTEGRITY-178B – A DO-178B certified version of INTEGRITY.
µ-velOSity – A lightweight microkernel.
Harris Corporation
Vulcan O/S – Proprietary O/S for Harris' Computer Systems
Harris UNIX – Proprietary UNIX based OS for Harris' Computers
Heathkit, Zenith Data Systems
HDOS – ran on the H8 and Heath/Zenith Z-89 series
HT-11 – a modified version of RT-11 that ran on the Heathkit H11
Hewlett-Packard
HP Multi-Programming Executive – runs on HP 3000 and HP e3000 mini-computers
HP-UX – runs on HP9000 and Itanium servers
NonStop OS – runs on HP's NonStop line of Itanium servers
Honeywell
CP-6
Huawei
Harmony OS
Intel Corporation
iRMX – real-time operating system originally created to support the Intel 8080 and 8086 processor families in embedded applications.
ISIS, ISIS-II – "Intel Systems Implementation Supervisor" was an environment for development of software within the Intel microprocessor family in the early 1980s on their Intellec Microcomputer Development System and clones. ISIS-II worked with 8 inch floppy disks and had an editor, cross-assemblers, a linker, an object locator, debugger, compilers for PL/M, a BASIC interpreter, etc. and allowed file management through a console.
IBM

On early mainframes: 1400, 701, 704, 709, 7090, 7094

BESYS – for the IBM 7090
Compatible Time-Sharing System – developed at MIT's Computation Center for use on a modified IBM 7094
GM OS & GM-NAA I/O – for the IBM 704
IBSYS – tape based operating system for IBM 7090 and IBM 7094
IJMON – A bootable serial I/O monitor for loading programs for the IBM 1400 series
SHARE Operating System – for the IBM 704 and 709
University of Michigan Executive System
On S/360, S/370, and successor mainframes
OS/360 and successors on IBM S/360, S/370, and successor mainframes
*OS/360
** PCP
** MFT
** MFT II
** MVT
* OS/VS,

Customer installations in the following variations:

** SVS
** OS/VS1
** OS/VS2
*** OS/VS2 R2
* MVS/SE
* MVS/SP
* MVS/XA
* MVS/ESA
* OS/390
* Phoenix/MVS
* z/OS
DOS/360 and successors on IBM S/360, S/370, and successor mainframes
* BOS/360
* TOS/360
* DOS/360
** DOS/360/RJE
* DOS/VS
* DOS/VSE
* VSE/SP
* VSE/ESA.
* z/VSE
CP/CMS and successors on IBM S/360, S/370, and successor mainframes
* CP-40/CMS
* CP-67/CMS
* VM/370
* VM/XA
* VM/ESA
* z/VM
TPF Line on IBM S/360, S/370, and successor mainframes
* ACP
* TPF
* z/TPF
Unix-like on IBM S/360, S/370, and successor mainframes
* AIX/370
* AIX/ESA
* OpenSolaris for System z
* UTS
* Linux on IBM Z
Others on IBM S/360, S/370, and successor mainframes:
* BOS/360
* MTS
* RTOS/360
* TOS/360
* TSS/360
* MUSIC/SP
* ORVYL and WYLBUR
On PC and Intel x86 based architectures
PC DOS, IBM DOS
* PC DOS 1.x, 2.x, 3.x
* IBM DOS 4.x, 5.0
* PC DOS 6.1, 6.3, 7, 2000, 7.10
OS/2
* OS/2 1.x
* OS/2 2.x
* OS/2 Warp 3
* OS/2 Warp 4
* eComStation
IBM 4680 OS version 1 to 4, a POS operating system based on Digital Research's Concurrent DOS 286 and FlexOS 286 1.xx
* IBM 4690 OS version 1 to 6.3, a successor to 4680 OS based on Novell's FlexOS 286/FlexOS 386 2.3x
** Toshiba 4690 OS version 6.4, a successor to 4690 OS 6.3
Unix-like on PS/2
* AIX
On other hardware platforms
IBM Series/1
* EDX
* RPS
* CPS
* SerIX
IBM 1130
* DMS
IBM 1800
* TSX
* MPX
IBM 8100
* DPCX
* DPPX
IBM System/3
* DMS
IBM System/34, IBM System/36
* SSP
IBM System/38
* CPF
IBM System/88
* Stratus VOS
AS/400, iSeries, System i, Power Systems i Edition
* OS/400
* i5/OS
* IBM i
UNIX on IBM RT PC
* AOS
* AIX
UNIX on POWER ISA, PowerPC, and Power ISA
* AIX
Others
* Workplace OS
* K42
* Dynix
International Computers Limited
J and MultiJob – for the System 4 series mainframes
GEORGE 2/3/4 GEneral ORGanisational Environment – used by ICL 1900 series mainframes
Executive – used on the 1900 and 290x range of minicomputers. A modified version of Executive was also used as part of GEORGE 3 and 4.
TME – used on the ME29 minicomputer
ICL VME – including early variants VME/B and VME/2900, appearing on the ICL 2900 Series and Series 39 mainframes, implemented in S3
VME/K – on early smaller 2900s
Jide
Remix OS
Lynx Real-time Systems, LynuxWorks, Lynx Software Technologies
LynxOS
Micrium Inc.
MicroC/OS-II – small pre-emptive priority based multi-tasking kernel
MicroC/OS-III – small pre-emptive priority based multi-tasking kernel, with unlimited number of tasks and priorities, and round robin scheduling
Microsoft Corporation
Xenix
MSX-DOS
MS-DOS
DOS/V
Windows
* Windows 1.0
* Windows 2.0
* Windows 3.0
* Windows 3.1x
* Windows for Workgroups 3.1
* Windows 3.2
* Windows for Workgroups 3.11
* Windows 95
* Windows 98
* Windows Millennium Edition
Windows NT
*Windows NT 3.1
* Windows NT 3.5
* Windows NT 3.51
* Windows NT 4.0
* Windows 2000
* Windows XP
* Windows Server 2003
* Windows Fundamentals for Legacy PCs
* Windows Vista
* Windows Azure 2009
* Windows Home Server
* Windows Server 2008
* Windows 7
* Windows Phone 7
*Windows Server 2008 R2
*Windows Home Server 2011
*Windows Server 2012
*Windows 8
*Windows Phone 8
*Windows 8.1
* Windows Phone 8.1
*Windows Server 2012 R2
*Xbox One system software
*Windows 10
*Windows 10 Mobile
*Windows Server 2016
*Windows Server 2019
Windows CE
*Windows CE 3.0
* Windows CE 5.0
* Windows CE 6.0
* Windows Mobile
Singularity – A research operating system written mostly in managed code
Midori – A managed code operating system
Xbox 360 system software
Xbox One system software
Azure Sphere
ThreadX
MITS
Altair DOS – An early disk operating system for the Altair 8800 machine.
MontaVista
MontaVista Mobilinux
NCR Corporation
TMX – Transaction Management eXecutive
IMOS – Interactive Multiprogramming Operating System, for the NCR Century 8200 series minicomputers
VRX – Virtual Resource eXecutive
Nintendo
ES is a computer operating system developed originally by Nintendo and since 2008 by Esrille. It is open source and runs natively on x86 platforms.
NeXT
NeXTSTEP
Novell
NetWare – network operating system providing high-performance network services. Has been superseded by Open Enterprise Server line, which can be based on NetWare or Linux to provide the same set of services.
UnixWare
* Novell "SuperNOS" – a never released merge of NetWare and UnixWare
Novell "Corsair"
* Novell "Exposé"
Open Enterprise Server – the successor to NetWare
Quadros Systems
RTXC Quadros RTOS – proprietary C-based RTOS used in embedded systems
RCA
Time Sharing Operating System – first OS supporting virtual addressing of the main storage and support for both timeshare and batch interface
RoweBots
DSPnano RTOS – 8/16 Bit Ultra Tiny Embedded Linux Compatible RTOS
Samsung Electronics
Bada
Tizen is an operating system based on the Linux kernel, a project within the Linux Foundation and is governed by a Technical Steering Group while controlled by Samsung and backed by Intel. Tizen works on a wide range of Samsung devices including smartphones, tablets, smart TVs, PCs and wearable.
SCO, SCO Group
Xenix, Unix System III based distribution for the Intel 8086/8088 architecture
* Xenix 286, Unix System V Release 2 based distribution for the Intel 80286 architecture
* Xenix 386, Unix System V Release 2 based distribution for the Intel 80386 architecture
SCO Unix, SCO UNIX System V/386 was the first volume commercial product licensed by AT&T to use the UNIX System trademark. Derived from AT&T System V Release 3.2 with an infusion of Xenix device drivers and utilities plus most of the SVR4 features
* SCO Open Desktop, the first 32-bit graphical user interface for UNIX Systems running on Intel processor-based computers. Based on SCO Unix
SCO OpenServer 5, AT&T UNIX System V Release 3 based
SCO OpenServer 6, SVR5 based kernel with SCO OpenServer 5 application and binary compatibility, system administration, and user environments
UnixWare
* UnixWare 2.x, based on AT&T System V Release 4.2MP
* UnixWare 7, UnixWare 2 kernel plus parts of 3.2v5. Referred to by SCO as SVR5
Scientific Data Systems (SDS)
Berkeley Timesharing System for the SDS 940
SYSGO
PikeOS – a certified real time operating system for safety and security critical embedded systems
Tandy Corporation
TRSDOS – A floppy-disk-oriented OS supplied by Tandy/Radio Shack for their TRS-80 Z80-based line of personal computers. Eventually renamed as LS-DOS or LDOS.
Color BASIC – A ROM-based OS created by Microsoft for the TRS-80 Color Computer.
NewDos/80 – A third-party OS for Tandy's TRS-80 personal computers.
DeskMate – Operating system created by Tandy Corporation and introduced with the Tandy 1000 computer.
TCSC (later NCSC)
Edos – enhanced version of IBM's DOS/360 operating system for System/360 and System/370 IBM mainframes
Texas Instruments
TI-RTOS Kernel – Real-time operating system for TI's embedded devices.
TRON Project
TRON – open real-time operating system kernel
T-Kernel
UNIVAC, Unisys
EXEC I
EXEC II
EXEC 8/OS 1100/OS 2200
VS/9, successor to RCA TSOS
Wang Laboratories
WPS Wang Word Processing System. Micro-code based system.
OIS Wang Office Information System. Successor to the WPS. Combined the WPS and VP/MVP systems.
Wind River Systems
VxWorks – Small footprint, scalable, high-performance RTOS for embedded microprocessor based systems.
Zilog
Z80-RIO
Zorin Group
Zorin OS
Other

Lisp-based

Lisp Machines, Inc. used an operating system written in MIT's Lisp Machine Lisp.
Symbolics Genera written in a systems dialect of the Lisp programming language called ZetaLisp and Symbolics Common Lisp. Genera was ported to a virtual machine for the DEC Alpha line of computers.
Texas Instruments' Explorer Lisp machine workstations also had systems code written in Lisp Machine Lisp.
Xerox 1100 series of Lisp machines used an operating system also written in Interlisp, and was also ported to a virtual machine called "Medley."
For Elektronika BK
ANDOS
CSI-DOS
MK-DOS
Non-standard language-based
Pilot operating system – written in the Mesa and used in Xerox Star workstations
PERQ Operating System – written in PERQ Pascal
Other proprietary non-Unix-like
Эльбрус-1 and Эльбрус-2 – used for application, job control, system programming, implemented in uЭль-76.
EOS – developed by ETA Systems for use in their ETA-10 line of supercomputers
EMBOS – developed by Elxsi for use on their mini-supercomputers
GCOS – a proprietary Operating System originally developed by General Electric
MAI Basic Four – An OS implementing Business Basic from MAI Systems.
Michigan Terminal System – Developed by a group of universities in the US, Canada, and the UK for use on the IBM System/360 Model 67, the System/370 series, and compatible mainframes
MUSIC/SP – an operating system developed for the S/370, running normally under VM
OS ES – an operating system for ES EVM
PC-MOS/386 – DOS-like, but multiuser/multitasking
Prolog-Dispatcher – used to control Soviet Buran space ship.
SINTRAN III – an operating system used with Norsk Data computers.
SkyOS – commercial desktop OS for PCs
SODA – used by the Odra 1204 computers.
THEOS
TSX-32 – a 32-bit operating system for x86 platform.
TX990/TXDS, DX10 and DNOS – proprietary operating systems for TI-990 minicomputers
Other proprietary Unix-like and POSIX-compliant
Aegis
Amiga Unix
Coherent
DC/OSx
DG/UX
DNIX from DIAB
DSPnano RTOS
HeliOS developed and sold by Perihelion Software mainly for transputer-based systems
Interactive Unix
IRIX from SGI
MeikOS
NeXTSTEP
OS-9 Unix-like RTOS.
OS9/68K Unix-like RTOS.
OS-9000 Unix-like RTOS.
OSF/1
OpenStep
QNX
Rhapsody
RISC iX – derived from BSD 4.3, by Acorn computers, for their ARM family of machines
RISC/os
RMX
SCO UNIX
SINIX
Solaris
SunOS
SUPER-UX
System V
System V/AT, 386
Trusted Solaris
UniFLEX
Unicos
UTX-32
Zenix, Zenith corporations Unix
Non-proprietary

Unix or Unix-like

MINIX
BSD
* FreeBSD
** DragonFlyBSD, forked from FreeBSD 4.8
** MidnightBSD, forked from FreeBSD 6.1
** GhostBSD
** TrueOS
* NetBSD
** OpenBSD forked from NetBSD
*** Bitrig forked from OpenBSD
* Darwin, created by Apple using code from NeXTSTEP, FreeBSD, and NetBSD
GNU
Linux
Redox
Android
*Android-x86
**Remix OS
Cray Linux Environment
OpenSolaris
*illumos, contains original Unix code derived from the OpenSolaris
**OpenIndiana, operates under the illumos Foundation. Uses the illumos kernel, which is a derivative of OS/Net, which is basically an OpenSolaris/Solaris kernel with the bulk of the drivers, core libraries, and basic utilities.
**Nexenta OS, based on the illumos kernel with Ubuntu packages
**SmartOS, an illumos distribution for cloud computing with Kernel-based Virtual Machine integration.
RTEMS
Haiku
Syllable Desktop
VSTa
Plurix
TUNIS
DahliaOS - fork of more well known Google_Fuchsia
Non-Unix
Cosmos – written in C#
FreeDOS – open source DOS variant
Genode – operating system framework for microkernels
Ghost OS – written in Assembly, C/C++
ITS – written by MIT students
osFree – OS/2 Warp open source clone.
OSv – written in C++
Phantom OS – persistent object oriented
ReactOS – open source OS designed to be binary compatible with Windows NT and its variants ; currently in development phase
SharpOS – written in.NET C#
TempleOS – written in HolyC
Visopsys – written by Andy McLaughlin
Research

Unix or Unix-like

Plan 9 from Bell Labs – distributed OS developed at Bell Labs, based on original Unix design principles yet functionally different and going much further
* Inferno – distributed OS derived from Plan 9, originally from Bell Labs
Research Unix
Non-Unix
Amoeba – research OS by Andrew S. Tanenbaum
Croquet
EROS – microkernel, capability-based
*CapROS – microkernel EROS successor
HelenOS – research and experimental operating system
House – Haskell User's Operating System and Environment, research OS written in Haskell and C
ILIOS – Research OS designed for routing
L4 – second generation microkernel
Mach – from OS kernel research at Carnegie Mellon University; see NeXTSTEP
Nemesis – Cambridge University research OS – detailed quality of service abilities
Singularity — experimental OS from Microsoft Research written in managed code to be highly dependable
Spring – research OS from Sun Microsystems
THE multiprogramming system – by Dijkstra in 1968, at the Eindhoven University of Technology in the Netherlands, introduced the first form of software-based memory segmentation, freeing programmers from being forced to use actual physical locations
V – from Stanford, early 1980s
Verve — OS designed by Microsoft Research to be verified end-to-end for type safety and memory safety
Xinu – Study OS developed by Douglas E. Comer in the United States
Disk operating systems (DOS)
86-DOS
* PC DOS
* MS-DOS
Concurrent CP/M-86 3.1 with PC-MODE
* Concurrent DOS 3.1-4.1
** Concurrent PC DOS 3.2
*** DOS Plus 1.1, 1.2, 2.1
** Concurrent DOS 8-16
** Concurrent DOS 286 1.x
*** FlexOS 1.00-2.34
**** FlexOS 186
**** FlexOS 286
***** Siemens S5-DOS/MT
***** IBM 4680 OS
***** IBM 4690 OS
****** Toshiba 4690 OS
**** FlexOS 386
***** IBM 4690 OS
****** Toshiba 4690 OS
** Concurrent DOS 386 1.0, 1.1, 2.0, 3.0
*** Concurrent DOS 386/MGE
*** Multiuser DOS 5.0, 5.01, 5.1
**** CCI Multiuser DOS 5.0-7.22
**** Datapac Multiuser DOS
***** Datapac System Manager 7
**** IMS Multiuser DOS 5.1, 7.0, 7.1
***** IMS REAL/32 7.50, 7.51, 7.52, 7.53, 7.54, 7.60, 7.61, 7.62, 7.63, 7.70, 7.71, 7.72, 7.73, 7.74, 7.80, 7.81, 7.82, 7.83, 7.90, 7.91, 7.92, 7.93, 7.94, 7.95
****** IMS REAL/NG
** Concurrent DOS XM 5.0, 5.2, 6.0, 6.2
*** DR DOS 3.31, 3.32, 3.33, 3.34, 3.35, 5.0, 6.0
**** Novell PalmDOS 1
**** Novell DR DOS "StarTrek"
**** Novell DOS 7
***** Novell DOS 7 updates 1-10
****** Caldera OpenDOS 7.01
******* Enhanced DR-DOS 7.01.0x
******** Dell Real Mode Kernel
***** Novell DOS 7 updates 11-15.2
****** Caldera DR-DOS 7.02-7.03
******* DR-DOS "WinBolt"
******* OEM DR-DOS 7.04-7.05
******* OEM DR-DOS 7.06
******* OEM DR-DOS 7.07
FreeDOS
ProDOS
PTS-DOS
TurboDOS for Z80 and Intel 8086 processor-based systems
Multi-tasking user interfaces and environments for DOS
* DESQview + QEMM 386 multi-tasking user interface for DOS
* DESQView/X
Network operating systems
Banyan VINES – by Banyan Systems
Cambridge Ring
Cisco IOS – by Cisco Systems
Cisco NX-OS – previously SAN-OS
CTOS – by Convergent Technologies, later acquired by Unisys
Data ONTAP – by NetApp
ExtremeWare – by Extreme Networks
ExtremeXOS – by Extreme Networks
Fabric OS – by Brocade
JunOS – by Juniper
NetWare – networking OS by Novell
Network operating system – developed by CDC for use in their Cyber line of supercomputers
Novell Open Enterprise Server – Open Source networking OS by Novell. Can incorporate either SUSE Linux or Novell NetWare as its kernel
Plan 9 – distributed OS developed at Bell Labs, based on Unix design principles but not functionally identical
*Inferno – distributed OS derived from Plan 9, originally from Bell Labs
TurboDOS – by Software 2000, Inc.
Generic, commodity, and other
BLIS/COBOL
Bluebottle also known as AOS
BS1000 by Siemens AG
BS2000 by Siemens AG, now BS2000/OSD from Fujitsu-Siemens Computers
BS3000 by Siemens AG
Contiki for various, mostly 8-bit systems, including the Apple II series, the Atari 8-bit family, and some Commodore machines.
FLEX9
GEM
GEOS
JavaOS
JNode, written 99% in Java, provides own JVM and JIT compiler. Based on GNU Classpath.
JX Java operating system that focuses on a flexible and robust operating system architecture developed as an open source system by the University of Erlangen.
KERNAL
MERLIN for the Corvus Concept
MorphOS
MSP by Fujitsu, now MSP/EX, also known as Extended System Architecture, for 31-bit mode
NetWare
Oberon for the Ceres and Chameleon workstation projects
OSD/XC by Fujitsu-Siemens
OS-IV by Fujitsu
Pick
PRIMOS by Prime Computer
Sinclair QDOS
SSB-DOS
SymbOS
Symobi
TripOS, 1978
TurboDOS
UCSD p-System
VOS by Stratus Technologies with strong influence from Multics
VOS3 by Hitachi for its IBM-compatible mainframes, based on IBM's MVS
VM2000 by Siemens AG
Visi On
VPS/VM
Hobby
AROS – AROS Research Operating System
AtheOS – branched to become Syllable Desktop
* Syllable Desktop – a modern, independently originated OS; see AtheOS
BareMetal
DexOS – 32-bit operating system written in x86 assembly
DSPnano RTOS
EmuTOS
EROS – Extremely Reliable Operating System
HelenOS – based on a preemptible microkernel design
LSE/OS
MenuetOS – extremely compact OS with GUI, written entirely in FASM assembly language
* KolibriOS – a fork of MenuetOS
ToaruOS
* PonyOS
SerenityOS
Embedded

Mobile operating systems

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List of operating systems

Proprietary

Acorn Computers

Amiga Inc.

Amstrad

Apple Inc.

Apollo Computer

Atari

BAE Systems

Be Inc.

Bell Labs

Burroughs Corporation, Unisys

Commodore International

Control Data Corporation

Convergent Technologies

Cromemco

Data General

Datapoint

DDC-I, Inc.

Digital Research, Inc.

Digital Equipment Corporation, Tandem Computers, Compaq, Hewlett-Packard

ENEA AB

Fujitsu

General Electric, Honeywell, Bull

Google

Green Hills Software

Harris Corporation

Heathkit, Zenith Data Systems

Hewlett-Packard

Honeywell

Huawei

Intel Corporation

IBM

On early mainframes: 1400, 701, 704, 709, 7090, 7094

On S/360, S/370, and successor mainframes

On PC and Intel x86 based architectures

On other hardware platforms

International Computers Limited

Jide

Lynx Real-time Systems, LynuxWorks, Lynx Software Technologies

Micrium Inc.

Microsoft Corporation

MITS

MontaVista

NCR Corporation

Nintendo

NeXT

Novell

Quadros Systems

RCA

RoweBots

Samsung Electronics

SCO, SCO Group

Scientific Data Systems (SDS)

SYSGO

Tandy Corporation

TCSC (later NCSC)

Texas Instruments

TRON Project

UNIVAC, Unisys

Wang Laboratories

Wind River Systems

Zilog

Zorin Group

Other

Lisp-based

For Elektronika BK

Non-standard language-based

Other proprietary non-Unix-like

Other proprietary Unix-like and POSIX-compliant

Non-proprietary

Unix or Unix-like

Non-Unix

Research

Unix or Unix-like

Non-Unix

Disk operating systems (DOS)

Network operating systems

Generic, commodity, and other

Hobby