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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 (Motorola 68000)
            • AmigaOS 4 (PowerPC)
          • Amiga Unix (aka Amix)

          Apple Inc.

          • Apple II family
            • Apple DOS
            • Apple Pascal
            • ProDOS
            • GS/OS
          • Apple III
            • Apple SOS
          • Apple Lisa
            • Lisa Workshop
            • Lisa Operating System
          • Apple Macintosh
            • Mac OS
            • A/UX (UNIX System V with BSD extensions)
            • Rhapsody
            • NeXTSTEP
            • OS X (formerly Mac OS X)
            • OS X Server (formerly Mac OS X Server)
          • Apple Network Server
            • IBM AIX (Apple-customized)
          • Apple MessagePad
            • Newton OS
          • iPhoneiPod TouchiPad
          • Embedded operating systems
            • A/ROSE
            • iPod software (unnamed embedded OS for iPod)
            • 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 (for 8-bit computers)
          • Atari TOS
          • Atari MultiTOS

          BAE Systems

          • XTS-400

          Be Inc.

          • BeOS
            • BeIA
            • BeOS r5.1d0
              • magnussoft ZETA (based on BeOS r5.1d0 source code, developed by yellowTAB)

          Bell Labs

          • Unix ("Ken's new system," for its creator (Ken Thompson), officially Unics and then Unix, the prototypic operating system created in Bell Labs in 1969 that formed the basis for the Unix family of operating systems)
            • 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 (It is from Version 7 Unix (and, to an extent, its descendants listed below) that almost all Unix-based and Unix-like operating systems descend.)
              • 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

          Bull SAS

          • GCOS

          Burroughs Corporation

          • Burroughs MCP

          Control Data Corporation

          • Chippewa Operating System (COS)
            • MACE (Mansfield and Cahlander Executive)
              • Kronos (Kronographic OS)
              • NOS (Network Operating System)
                • NOS/BE NOS Batch Environment
                • NOS/VE NOS Virtual Environment
            • SCOPE (Supervisory Control Of Program Execution)
            • SIPROS (for Simultaneous Processing Operating System)
          • EP/IX (Enhanced Performance Unix)

          Convergent Technologies

          • Convergent Technologies Operating System (later acquired by Unisys)

          Data General

          • AOS for 16-bit Data General Eclipse computers and AOS/VS for 32-bit (MV series) Eclipses, MP/AOS for microNOVA-based computers
          • DG/UX
          • RDOS Real-time Disk Operating System, with variants: RTOS and DOS (not related to PC DOS, MS-DOS etc.)

          DataPoint

          • CTOS Z-80 based, Cassette Tape Operating System for early desktop systems. Capable of up to 8 simultaneous users. Replaced by DataPoint DOS.
          • DOS Intel 808x/80x86-based, Disk Operating Systems for desktop systems. Capable of up to 32 users per node. Supported a sophisticated network of nodes that were often purpose-built. The name DOS was used in these products login screens before it was popularized by IBM, Microsoft and others.

            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 2.2 with BDOS 2.8
                • 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-MODEConcurrent 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 hostsSiemens 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 1.2 - 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/Tandem Computers/Compaq/HP

            • 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)
            • TENEX (a variant of TOPS-20 from BBN, for the PDP-10)
            • TOPS-10 (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, now by HP) for the VAX mini-computer range, Alpha and Intel Itanium 2; 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

            General Electric

            • Real-Time Multiprogramming Operating System

            Google

            Android 4.0.1 on the Galaxy Nexus
            • Google 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.
              • Chromium OS is an open source operating system development version of Google Chrome OS. Both operating systems are based on the Linux kernel.
            • Android is an operating system for mobile devices. It consists of Dalvik (userland) with Linux (kernel), with its Linux kernel modified to add drivers for mobile device hardware and to remove unused Vanilla Linux drivers.

            Green Hills Software

            • INTEGRITY Reliable Operating system
            • INTEGRITY-178B A DO-178B certified version of INTEGRITY.
            • µ-velOSity A lightweight microkernel.

            Heathkit/Zenith Data Systems

            • HDOS; ran on the H8 and Heath/Zenith Z-89 series
            • HT-11 (a modified version of RT-11) ran on the Heathkit H11

            Hewlett-Packard

            • HP Multi-Programming Executive; (MPE, MPE/XL, and MPE/iX) runs on HP 3000 and HP e3000 mini-computers.
            • HP-UX; runs on HP9000 and Itanium servers - from small to mainframe-class computers.
            • NonStop OS; runs on HP's NonStop line of Itanium servers.

            Honeywell

            • Multics
            • GCOS

            Intel Corporation

            • iRMX; real-time operating system originally created to support the Intel 8080 and 8086 processor families in embedded applications.
            • ISIS-II; "Intel Systems Implementation Supervisor" was THE 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 PLM (PL/I for microprocessors of the 8080/86 family), a BASIC interpreter, etc. and allowed file management through a console.

            IBM

            On early IBM mainframes (1400, 1800, 701, 704, 709, 7090, and 7094)

            • BESYS (for the IBM 7090)
            • CTSS (The 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 IBM 1400 and IBM 1800)
            • SOS (SHARE Operating System, for the IBM 704 and 709)
            • UMES (University of Michigan Executive System, for the IBM 704709, and 7090)

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

            • OS/360 and successors on IBM S/360, S/370, and successor mainframes
              • OS/360 (first official OS targeted for the System/360 architecture),
                Saw customer installations of the following variations:
                • PCP (Primary Control Program, a kernel and a ground breaking automatic space allocating file system)
                • MFT (original Multi-programming with a Fixed number of Tasks, replaced by MFT II)
                • MFT II (Multi-Programming with a Fixed number of Tasks, had up to 15 fixed size application partitions, plus partitions for system tasks, initially defined at boot time but redefinable by operator command)
                • MVT (Multi-Programming Variable Tasks, had up to 15 application regions defined dynamically, plus additional regions for system tasks)
              • OS/VS (port of OS/360 targeted for the System/370 virtual memory architecture, "OS/370" is not correct name for OS/VS1 and OS/VS2, but rather refers to OS/VS2 MVS and MVS/SP Version 1),
                Customer installations in the following variations:
                • SVS (Single Virtual Storage, both VS1 & VS2 began as SVS systems)
                • OS/VS1 (Operating System/Virtual Storage 1, Virtual-memory version of MFT II)
                • OS/VS2 (Operating System/Virtual Storage 2, Virtual-memory version of OS/MVT but without multiprocessing support)
                  • OS/VS2 R2 (called Multiple Virtual Storage, MVS, eliminated most need for VS1)
              • MVS/SE (MVS System Extensions)
              • MVS/SP (MVS System Product)
              • MVS/XA (MVS/SP V2. MVS supported eXtended Architecture, 31-bit addressing)
              • MVS/ESA (MVS supported Enterprise System Architecture, horizontal addressing extensions: data only address spaces called Dataspaces; a Unix environment was available starting with MVS/ESA V4R3)
              • OS/390 (Upgrade from MVS, with an additional Unix environment)
              • z/OS (OS/390 supported z/Architecture64-bit addressing)
            • DOS/360 and successors on IBM S/360, S/370, and successor mainframes
              • BOS/360 (early interim version of DOS/360, briefly available at a few Alpha & Beta System/360 sites)
              • TOS/360 (similar to BOS above and more fleeting, able to boot and run from 2x00 series tape drives)
              • DOS/360 (Disk Operating System (DOS), multi-programming system with up to 3 partitions, first commonly available OS for System/360)
                • DOS/360/RJE (DOS/360 with a control program extension that provided for the monitoring of remote job entry hardware (card reader & printer) connected by dedicated phone lines)
              • DOS/VS (First DOS offered on System/370 systems, provided virtual storage)
              • DOS/VSE (also known as VSE, upgrade of DOS/VS, up to 14 fixed size processing partitions )
              • VSE/SP (program product replacing DOS/VSE and VSE/AF)
              • VSE/ESA (DOS/VSE extended virtual memory support to 32-bit addresses (Extended System Architecture)).
              • z/VSE (latest version of the four decades old DOS lineage, supports 64-bit addresses, multiprocessing, multiprogramming, SNA, TCP/IP, and some virtual machine features in support of Linux workloads)
            • CP/CMS (Control Program/Cambridge Monitor System) and successors on IBM S/360, S/370, and successor mainframes
              • CP-40/CMS (for System/360 Model 40)
              • CP-67/CMS (for System/360 Model 67)
              • VM/370 (Virtual Machine / Conversational Monitor System, virtual memory operating system for System/370)
              • VM/XA (VM/eXtended Architecture for System/370 with extended virtual memory)
              • VM/ESA (Virtual Machine / Extended System Architecture, added 31-bit addressing to VM series)
              • z/VM (z/Architecture version of the VM OS with 64-bit addressing)
            • TPF Line (Transaction Processing Facility) on IBM S/360, S/370, and successor mainframes (largely used by airlines)
              • ACP (Airline Control Program)
              • TPF (Transaction Processing Facility)
              • z/TPF (z/Architecture extension)
            • Unix-like on IBM S/360, S/370, and successor mainframes
              • AIX/370 (IBM's Advanced Interactive eXecutive, a System V Unix version)
              • AIX/ESA (IBM's Advanced Interactive eXecutive, a System V Unix version)
              • OpenSolaris for IBM System z
              • UTS (developed by Amdahl)
              • z/Linux
            • Others on IBM S/360, S/370, and successor mainframes:
              • BOS/360 (Basic Operating System)
              • MTS (Michigan Terminal System, developed by a group of universities in the US, Canada, and the UK for the IBM System/360 Model 67, System/370 series, and compatible mainframes)
              • RTOS/360 (IBM's Real Time Operating System, ran on 5 NASA custom System/360-75s)[3]
              • TOS/360 (Tape Operating System)
              • TSS/360 (IBM's Time Sharing System)
              • MUSIC/SP (developed by McGill University for IBM System/370)
              • ORVYL and WYLBUR (developed by Stanford University for IBM System/360)

            On IBM PC and Intel x86 based architectures

            • PC DOS / IBM DOS
              • PC DOS 1.x, 2.x, 3.x (developed jointly with Microsoft)
              • IBM DOS 4.x, 5.0 (developed jointly with Microsoft)
              • PC DOS 6.1, 6.3, 7, 2000, 7.10
            • OS/2
              • OS/2 1.x (developed jointly with Microsoft)
              • OS/2 2.x
              • OS/2 Warp 3
              • OS/2 Warp 4
              • eComStation (Warp 4.5/Workspace on Demand, rebundled by Serenity Systems International)
            • 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

            On other IBM hardware platforms

            • IBM Series/1
              • EDX (Event Driven Executive)
              • RPS (Realtime Programming System)
              • CPS (Control Programming Support, subset of RPS)
              • SerIX (Unix on Series/1)
            • IBM 1130
              • DMS (Disk Monitor System)
            • IBM 1800
              • TSX (Time Sharing eXecutive)
              • MPX (Multi Programming eXecutive)
            • IBM 8100
              • DPCX (Distributed Processing Control eXecutive)
              • DPPX (Distributed Processing Programming Executive)
            • IBM System/3
              • DMS (Disk Management System)
            • IBM System/34IBM System/36
              • SSP (System Support Program)
            • IBM System/38
              • CPF (Control Program Facility)
            • IBM System/88
              • Stratus VOS (developed by Stratus, and used for IBM System/88Original equipment manufacturer from Stratus)
            • AS/400, iSeries, System i, Power Systems i Edition
              • OS/400 (descendant of System/38 CPF, include System/36 SSP environment)
              • i5/OS (extends OS/400 with significant interoperability features)
              • IBM i (extends i5/OS)
            • UNIX on IBM POWER
              • AIX (Advanced Interactive eXecutive, a System V Unix version)
              • AOS (a BSD Unix version, not related to Data General AOS)
            • Others
              • IBM Workplace OS (Microkernel based operating system, developed and canceled in 1990s)
              • K42 (open-source research operating system on PowerPC or x86 based cache-coherent multiprocessor systems)
              • Dynix (developed by Sequent, and used for IBM NUMA-Q too)

            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 290x range of minicomputers
            • 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

            LynuxWorks (originally Lynx Real-time Systems)

            • 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 (licensed version of Unix; licensed to SCO in 1987)
            • MSX-DOS (developed by MS Japan for the MSX 8-bit computer)
            • MS-DOS (developed jointly with IBM, versions 1.0–6.2.2)
            • Windows (16-bit and 32-bit preemptive and cooperative multitasking, running on top of MS-DOS)
              • Windows 1.0 (Windows 1)
              • Windows 2.0 (Windows 2 - separate version for i386 processor)
              • Windows 3.0 (Windows 3)
              • Windows 3.1.x (Windows 3.1)
              • Windows for Workgroups 3.1 (Codename Snowball)
              • Windows 3.2 (Chinese-only release)
              • Windows for Workgroups 3.1.1
              • Windows 95 (Codename Chicago - Windows 4.0)
              • Windows 98 (Codename Memphis - Windows 4.1)
              • Windows Millennium Edition (Windows ME - Windows 4.9)
            • Windows NT (Full 32-bit or 64-bit kernel, not dependent on MS-DOS)
              • Windows NT 3.1
              • Windows NT 3.5
              • Windows NT 3.51
              • Windows NT 4.0
              • Windows 2000 (Windows NT 5.0)
              • Windows XP (Windows NT 5.1)
              • Windows Server 2003 (Windows NT 5.2)
              • Windows Fundamentals for Legacy PCs (based on Windows XP)
              • Windows Vista (Windows NT 6.0)
              • Windows Azure (Cloud OS Platform) 2009
              • Windows Home Server (based on Windows Server 2003)
              • Windows Server 2008 (based on Windows Vista)
              • Windows 7 (Windows NT 6.1)
              • Windows Server 2008 R2 (based on Windows 7)
              • Windows Home Server 2011 (based on Windows Server 2008 R2)
              • Windows Server 2012 (based on Windows 8)
              • Windows 8 (Windows NT 6.2)
              • Windows Phone 8
              • Windows 8.1 (Windows NT 6.3)
              • Windows Server 2012 R2 (based on Windows 8.1)
              • Xbox One system software
              • Windows Phone 8.1
              • Windows 10
            • Windows CE (OS for handhelds, embedded devices, and real-time applications that is similar to other versions of Windows)
              • Windows CE 3.0
              • Windows CE 5.0
              • Windows CE 6.0
              • Windows Mobile (based on Windows CE, but for a smaller form factor)
              • Windows Phone 7
              • Windows Phone 8
              • Windows Phone 8.1
            • Singularity - A research operating system written mostly in managed code (C#)
            • Midori - A managed code operating system
            • Xbox 360 system software

            MontaVista Software

            • MontaVista Mobilinux

            NCR Corporation

            • TMX - Transaction Management 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.

            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 ows

            RCA

            • TSOS, 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
            • Unison RTOS 32 Bit Open Standards, Linux Compatible, Ultra Tiny Size, Modularity, POSIX-compliant RTOS which supports a variety of wireless modules and provides a complete set of security protocols

            Samsung Electronic

            SCO / The 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 (1989). 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 (UnixWare 7) 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 (UnixWare 2 + OpenServer 5 = UnixWare 7). Referred to by SCO as SVR5

            Scientific Data Systems (SDS)

            • Berkeley Timesharing System for the SDS 940

            SYSGO

            • PikeOS is a certified real time operating system for safety and security critical embedded systems

            Tandy Corporation

            • TRS-DOS; A floppy-disk-oriented OS supplied by Tandy/Radio Shack for their Z80-based line of personal computers. Eventually renamed as LS-DOS or LDOS.
            • NewDos/80; A third-party OS for Tandy's TRS-80 personal computers.
            • DeskMate; Operating system

            TRON Project

            • TRON (open real-time operating system kernel)
            • T-Kernel

            Unisys

            • Unisys OS 2200 operating system

            UNIVAC (later Unisys)

            • EXEC I
            • EXEC II
            • EXEC 8 Ran on 1100 series.
            • 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.
            • Wang VS Operating System (VSOS) - used on the VS line of minicomputer systems.

            Wind River Systems

            • VxWorks Small footprint, scalable, high-performance RTOS

            Other

            Lisp-based

            • Lisp Machines, Inc. (also known as LMI) 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."

            Non-standard language-based

            • Pilot operating system (used in Xerox Star workstations) was written in the Mesa programming language.
            • PERQ Operating System (POS) was written in PERQ Pascal.

            Other proprietary non-Unix-like

            • Эльбрус-1 (Elbrus-1) and Эльбрус-2 used for application, job control, system programming, implemented in uЭль-76 (AL-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 is 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
            • 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 (Apollo Computer)
            • Amiga Unix (Amiga ports of Unix System V release 3.2 with Amiga A2500UX and SVR4 with Amiga A3000UX. Started in 1990, last version was in 1992)
            • Coherent (Unix-like OS from Mark Williams Co. for PC class computers)
            • DC/OSx (DataCenter/OSx was an operating system for MIPS based systems developed by Pyramid Technology)
            • DG/UX (Data General Corp)
            • DNIX from DIAB
            • DSPnano RTOS (POSIX nanokernel, DSP Optimized, Open Source)
            • HeliOS developed and sold by Perihelion Software mainly for transputer based systems
            • Interactive Unix (a port of the UNIX System V operating system for Intel x86 by Interactive Systems Corporation)
            • IRIX from SGI
            • MeikOS
            • 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)
            • OS9/68K Unix-like RTOS. (OS from Microware for Motorola 680x0 based microcomputers; based on OS-9)
            • OS-9000 Unix-like RTOS. (OS from Microware for Intel x86 based microcomputers; based on OS-9, written in C)
            • OSF/1 (developed into a commercial offering by Digital Equipment Corporation)
            • OpenStep
            • QNX (POSIX, microkernel OS; usually a real time embedded OS)
            • Rhapsody (an early form of OS X)
            • RISC iX - Derived from BSD 4.3, by Acorn computers, for their ARM family of machines.
            • RISC/os (a port by MIPS of 4.3BSD to the RISC MIPS architecture)
            • RMX
            • SCO UNIX (from SCO, bought by Caldera who renamed themselves SCO Group)
            • SINIX (a port by SNI of Unix to the RISC MIPS architecture)
            • Solaris (Sun's System V-based replacement for SunOS)
            • SunOS (BSD-based Unix system used on early Sun hardware)
            • SUPER-UX (a port of System V Release 4.2MP with features adopted from BSD and Linux for NEC SX architecture supercomputers)
            • 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)
            • Trusted Solaris (Solaris with kernel and other enhancements to support multilevel security)
            • UniFLEX (Unix-like OS from TSC for DMA-capable, extended addresses, Motorola 6809 based computers; e.g. SWTPC, GIMIX, …)
            • Unicos (the version of Unix designed for Cray Supercomputers, mainly geared to vector calculations)
            • UTX-32 (Developed by Gould CSD (Computer System Division), a Unix-based OS that included both BSD and System V characteristics. It was one of the first Unix based systems to receive NSA's C2 security level certification.)

            Non-proprietary

            Unix-like

            Research Unix-like and other POSIX-compliant

            • Minix (study OS developed by Andrew S. Tanenbaum in the Netherlands)
            • Plan 9 (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)
              • Plan B (distributed OS derived from Plan 9 and Off++ microkernel)
            • Unix (OS developed at Bell Labs ca 1970 initially by Ken Thompson)
            • Xinu (Study OS developed by Douglas E. Comer in the USA)

            Free and open source Unix-like

            Ubuntu, an example of a Unix-like system
            • BSD (Berkeley Software Distribution, a variant of Unix for DEC VAX hardware)
              • FreeBSD (one of the outgrowths of UC Regents' abandonment of CSRG's 'BSD Unix')
                • DragonFlyBSD, forked from FreeBSD 4.8
                • Darwin, created by Apple using FreeBSD and NeXTSTEP
                • GhostBSD
                • PC-BSD
              • NetBSD (an embeded device BSD variant)
                • OpenBSD forked from NetBSD
            • GNU
            • Linux
              • Cray Linux Environment
            • OpenSolaris, contains original Unix (SVR4) code. Now discontinued by Oracle in favor of Solaris 11 Express
              • OpenIndiana, aims to continue development and distribution of OpenSolaris operating system. Operates under the Illumos Foundation. Uses the Illumos kernel, which is a derivative of OS/Net, which is basically a Solaris/OpenSolaris kernel with the bulk of the drivers, core libraries, and basic utilities.
              • Nexenta OS, based on the OpenSolaris kernel with Ubuntu packages
              • Jaris OS, based on OpenSolaris with support for Japanese
            • RTEMS (Real-Time Executive for Multiprocessor Systems)
            • Syllable Desktop
            • Univention Corporate Server
            • VSTa
              • FMI/OS, successor of VSTa

            Other Unix-like

            • Plurix
            • TUNIS (University of Toronto)

            Non-Unix-like

            Research non-Unix-like

            • Amoeba (research OS by Andrew S. Tanenbaum)
            • Croquet
            • EROS microkernel, capability-based
            • 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
              • CapROS microkernel EROS successor.
              • Coyotos microkernel EROS successor, goal: be first formally verified OS.
            • 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.
            • Spring (research OS from Sun Microsystems)
            • V from Stanford, early 1980s

            Free and open source non-Unix-like

            • Cosmos (written in C#)
            • FreeDOS (open source DOS variant)
            • Haiku (open source inspired by BeOS, under development)
            • ITS written by MIT students (for the PDP-6 and PDP-10)
            • MonaOS (written in C++)
            • 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 (Windows XPWindows 2000, etc.); currently in development phase
            • SharpOS (written in .NET C#)

            Disk operating systems

            • 86-DOS (developed at Seattle Computer Products by Tim Paterson for the new Intel 808x CPUs; licensed to Microsoft, became PC DOS/MS-DOS. Also known by its working title QDOS.)
              • PC DOS (IBM's DOS variant, developed jointly with Microsoft, versions 1.0–7.0, 2000, 7.10)
              • MS-DOS (Microsoft's DOS variant for OEM, developed jointly with IBM, versions 1.x–6.2.2 Microsoft's now abandoned DOS variant)
            • Concurrent CP/M-86 3.1 (BDOS 3.1) with PC-MODE (Digital Research's successor of CP/M-86 and MP/M-86)
              • Concurrent DOS 3.1-4.1 (BDOS 3.1-4.1)
                • Concurrent PC DOS 3.2 (BDOS 3.2) (Concurrent DOS variant for IBM compatible PCs)
                  • DOS Plus 1.2 (BDOS 4.1), 2.1 (BDOS 5.0) (single-user, multi-tasking system derived from Concurrent DOS 4.1-5.0)
                • Concurrent DOS 8-16 (dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs)
                • Concurrent DOS 286 1.x
                  • FlexOS 1.00-2.34 (derivative of Concurrent DOS 286)
                    • FlexOS 186 (variant of FlexOS for terminals)
                    • FlexOS 286 (variant of FlexOS for hosts)
                      • Siemens S5-DOS/MT (industrial control system based on FlexOS)
                      • IBM 4680 OS (POS operating system based on FlexOS)
                      • IBM 4690 OS (POS operating system based on FlexOS)
                        • Toshiba 4690 OS (POS operating system based on IBM 4690 OS and FlexOS)
                    • FlexOS 386 (later variant of FlexOS for hosts)
                      • IBM 4690 OS (POS operating system based on FlexOS)
                        • Toshiba 4690 OS (POS operating system based on IBM 4690 OS and FlexOS)
                • Concurrent DOS 386 1.0, 1.1, 2.0, 3.0 (BDOS 5.0-6.2)
                  • Concurrent DOS 386/MGE (Concurrent DOS 386 variant with advanced graphics terminal capabilities)
                  • Multiuser DOS 5.0, 5.01, 5.1 (BDOS 6.3-6.6) (successor of Concurrent DOS 386)
                    • CCI Multiuser DOS 5.0-7.22 (up to BDOS 6.6)
                    • Datapac Multiuser DOS
                      • Datapac System Manager 7 (derivative of Datapac Multiuser DOS)
                    • IMS Multiuser DOS 5.1, 7.0, 7.1 (BDOS 6.6-6.7)
                      • IMS REAL/32 7.50, 7.51, 7.52, 7.53, 7.54, 7.6, 7.7, 7.8, 7.90, 7.91, 7.92, 7.93, 7.94, 7.95 (BDOS 6.8 and higher) (derivative of Multiuser DOS)
                        • IMS REAL/NG (successor of REAL/32)
                • Concurrent DOS XM 5.0, 5.2, 6.0, 6.2 (BDOS 5.0-6.2) (real-mode variant of Concurrent DOS with EEMS support)
                  • DR DOS 3.31, 3.32, 3.33, 3.34, 3.35, 5.0, 6.0 (BDOS 6.0-7.1) single-user, single-tasking native DOS derived from Concurrent DOS 6.0)
                    • Novell PalmDOS 1.0 (BDOS 7.0)
                    • Novell DR DOS "StarTrek"
                    • Novell DOS 7 (single-user, multi-tasking system derived from DR DOS, BDOS 7.2)
                      • Novell DOS 7 updates 1-10 (BDOS 7.2)
                        • Caldera OpenDOS 7.01 (BDOS 7.2)
                          • Enhanced DR-DOS 7.01.0x (BDOS 7.2)
                            • Dell Real Mode Kernel (DRMK)
                      • Novell DOS 7 updates 11-15.2 (BDOS 7.2)
                        • Caldera DR-DOS 7.02-7.03 (BDOS 7.3)
                          • DR-DOS "WinBolt"
                          • OEM DR-DOS 7.04-7.05 (BDOS 7.3)
                          • OEM DR-DOS 7.06 (PQDOS)
                          • OEM DR-DOS 7.07 (BDOS 7.4/7.7)
            • FreeDOS (open source DOS variant)
            • ProDOS (operating system for the Apple II series computers)
            • PTS-DOS (DOS variant by Russian company Phystechsoft)
            • TurboDOS (Software 2000, Inc.) for Z80 and Intel 8086 processor-based systems
            • Multi-tasking user interfaces and environments for DOS
              • DESQviewQEMM 386 multi-tasking user interface for DOS
              • DESQView/X (X-windowing GUI for DOS)

            Network Operating systems

            • Cambridge Ring
            • Cisco IOS by Cisco Systems
            • CSIRONET by (CSIRO)
            • CTOS (Convergent Technologies, later acquired by Unisys)
            • Data ONTAP by NetApp
            • Enterprise OS by McDATA
            • ExtremeWare by Extreme Networks
            • ExtremeXOS by Extreme Networks
            • Fabric OS by Brocade
            • JunOS by Juniper
            • NetWare (networking OS by Novell)
            • NOS (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)
              • Plan B (distributed OS derived from Plan 9 and Off++ microkernel)
            • SAN-OS by Cisco (now NX-OS)
            • TurboDOS (Software 2000, Inc.)

            Web operating systems

            • Browser OS
            • Chrome OS
            • DesktopTwo
            • eyeOS
            • FullyOS
            • G.ho.st
            • Glide OS
            • Joli OS
            • YouOS

            Generic / commodity and other

            • BLIS/COBOL
            • Bluebottle also known as AOS (a concurrent and active object update to the Oberon operating system)
            • BS1000 by Siemens AG
            • BS2000 by Siemens AG, now BS2000/OSD from Fujitsu-Siemens Computers (formerly Siemens Nixdorf Informationssysteme)
            • BS3000 by Siemens AG (functionally similar to OS-IV and MSP from Fujitsu)
            • FLEX9 (by TSC for Motorola 6809 based machines; successor to FLEX, which was for Motorola 6800 CPUs)
            • GEM (windowing GUI for CP/M, DOS, and Atari TOS)
            • GEOS (popular windowing GUI for PC, Commodore, Apple computers)
            • JavaOS
            • JNode (Java New Operating System Design Effort), written 99% in Java (native compiled), 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 (default OS on Commodore 64)
            • MERLIN for the Corvus Concept
            • MorphOS (Amiga compatible)
            • MSP by Fujitsu (successor to OS-IV), now MSP/EX, also known as Extended System Architecture (EXA), for 31-bit mode
            • NetWare (networking OS by Novell)
            • Oberon (operating system) (developed at ETH-Zürich by Niklaus Wirth et al.) for the Ceres and Chameleon workstation projects.
            • OSD/XC by Fujitsu-Siemens (BS2000 ported to an emulation on a Sun SPARC platform)
            • OS-IV by Fujitsu (based on early versions of IBM's MVS)
            • Pick (often licensed and renamed)
            • PRIMOS by Prime Computer (sometimes spelled PR1MOS and PR1ME)
            • Sinclair QDOS (multitasking for the Sinclair QL computer)
            • SSB-DOS (by TSC for Smoke Signal Broadcasting; a variant of FLEX in most respects)
            • SymbOS (GUI based multitasking operating system for Z80 computers)
            • Symobi (GUI based modern micro-kernel OS for x86ARM and PowerPC processors, developed by Miray Software; used and developed further at Technical University of Munich)
            • TripOS, 1978
            • TurboDOS (Software 2000, Inc.)
            • UCSD p-System (portable complete programming environment/operating system/virtual machine developed by a long running student project at UCSD; directed by Prof Kenneth Bowles; written inPascal)
            • VOS by Stratus Technologies with strong influence from Multics
            • VOS by Hitachi for its IBM-compatible mainframes, based on IBM's MVS
            • VM2000 by Siemens AG
            • Visi On (first GUI for early PC machines; not commercially successful)
            • VPS/VM (IBM based, main operating system at Boston University for over 10 years.)

            For Elektronika BK

            • ANDOS
            • CSI-DOS
            • KMON
            • MK-DOS

            Hobby

            • AROS (AROS Research Operating System, formerly known as Amiga 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)
            • S-OS (a minimal DOS for Z80 machines)

            Embedded

            Personal digital assistants (PDAs)

            • DIP DOS on Atari Portfolio
            • Embedded Linux
              • Android
              • Ångström distribution
              • Familiar Linux
              • Maemo based on Debian deployed on Nokia's Nokia 770N800 and N810 Internet Tablets.
              • MeeGo merger of Moblin and Maemo
              • OpenZaurus
              • webOS from Palm, Inc., later Hewlett-Packard via acquisition, and most recently at LG Electronics through acquisition from Hewlett-Packard
            • Inferno (distributed OS originally from Bell Labs)
            • iOS (a subset of OS X)
            • Magic Cap
            • MS-DOS on Poqet PCHP 95LXHP 100LXHP 200LXHP 1000CXHP OmniGo 700LX
            • NetBSD
            • Newton OS on Apple MessagePad
            • Palm OS from Palm, Inc; now spun off as PalmSource
            • PEN/GEOS on HP OmniGo 100 and 120
            • PenPoint OS
            • Plan 9 from Bell Labs
            • PVOS
            • Symbian OS
            • Windows CE, from Microsoft
              • Pocket PC from Microsoft, a variant of Windows CE.
              • Windows Mobile from Microsoft, a variant of Windows CE.
              • Windows Phone from Microsoft,

            Digital media players

            • DSPnano RTOS
            • iOS (a subset of OS X)
            • iPod software
            • ipodlinux
            • iriver clix OS
            • RockBox

            Smartphones and Mobile phones

            • BlackBerry OS
            • Embedded Linux
              • Access Linux Platform
              • Android
              • Bada
              • Firefox OS (project name: Boot to Gecko)
              • Openmoko Linux
              • OPhone
              • MeeGo (from merger of Maemo & Moblin)
              • Mobilinux
              • MotoMagx
              • Qt Extended
              • Sailfish OS
              • Tizen (earlier called LiMo Platform)
              • webOS
            • PEN/GEOSGEOS-SCGEOS-SE
            • iOS (a subset of OS X)
            • Palm OS
            • Symbian platform (successor to Symbian OS)
            • Windows Mobile (superseded by Windows Phone)

            Routers

            • AlliedWare by Allied Telesis (aka Allied Telesyn)
            • AirOS by Ubiquiti Networks
            • CatOS by Cisco Systems
            • Cisco IOS (originally Internetwork Operating System) by Cisco Systems
            • DD-WRT by NewMedia-NET
            • Inferno (distributed OS originally from Bell Labs)
            • IOS-XR by Cisco Systems
            • IronWare by Foundry Networks
            • JunOS by Juniper Networks
            • LibreWRT GNU/Linux-libre
            • RouterOS by Mikrotik
            • ScreenOS by Juniper Networks, originally from Netscreen
            • Timos by Alcatel-Lucent
            • FTOS by Force10 Networks
            • RTOS by Force10 Networks
            • List of wireless router firmware projects

            Other embedded

            • Contiki
            • ERIKA Enterprise
            • eCos
            • NetBSD
            • uClinux
            • MINIX
            • NCOS
            • freeRTOS, openRTOS and safeRTOS
            • QNX
            • REX OS (microkernel OS; usually an embedded cell phone OS)
            • ROM-DOS
            • TinyOS
            • ThreadX
            • UbiquiOS by Virscient
            • DSPnano RTOS
            • Windows Embedded
              • Windows CE
              • Windows Embedded Standard
              • Windows Embedded Enterprise
              • Windows Embedded POSReady
            • Wombat OS (microkernel OS; usually a real time embedded OS)

            Capability-based

            LEGO Mindstorms

            • brickOS
            • leJOS

            Other capability-based

            • Cambridge CAP computer operating system demonstrated the use of security capabilities, both in hardware and software, also a useful fileserver. Implemented in ALGOL 68C.
            • Flex machine - The hardware was custom and microprogrammable, with an operating system, (modular) compiler, editor, * garbage collector and filing system all written in ALGOL 68.
            • HYDRA - Running on the C.mmp computer at Carnegie Mellon University, implemented in the programming language BLISS.
            • KeyKOS nanokernel
              • EROS microkernel
                • CapROS EROS successor
                • Coyotos EROS successor, goal: be first formally verified OS
            • V from Stanford, early 1980s



            Last updated on 29 October 2014 at 12:53.


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