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

Allah Computers

• Allah

Street - Crrylx

Street Os

MITS

• Altair DOS – An early disk operating system for the Altair 8800 machine.

MontaVista

• MontaVista Mobilinux

Motorola

• VERSAdos

NCR Corporation

• TMX – Transaction Management eXecutive
• IMOS – Interactive Multiprogramming Operating System (circa 1978), for the NCR Century 8200 series minicomputers
• VRX – Virtual Resource eXecutive

NeXT

• NeXTSTEP

Nintendo

• ES – a computer operating system developed originally by Nintendo and since 2008 by Esrille. It is open source and runs natively on x86 platforms.
• Wii system software
• Wii U system software
• Nintendo Switch system software

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 Has been superseded by Open Enterprise Server line, which can be based on NetWare or Linux to provide the same set of services.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

Open Mobile Platform

• Aurora OS – the successor to Sailfish OS (not to be confused with a different Aurora OS)

Quadros Systems

• RTXC Quadros RTOS – proprietary C-based RTOS used in embedded systems

RCA

• Time Sharing Operating System (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

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 (TSG) 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.
• Orsay
• One UI - Android skin

Scientific Data Systems (SDS)

• Berkeley Timesharing System for the SDS 940

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 (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

Silicon Laboratories (formerly Micrium Inc.)

• Micrium OS - customized μC/OS-III for Silicon Laboratories's SoC products

Sinclair Research

• Sinclair BASIC was used in the 8-bit home computers from Sinclair Research and Timex Sinclair. It was included in the ROM, and the computers booted to the Basic interpreter. Various versions exist, with the latter ones supporting disk drive operations.

Sony

• PlayStation 3 system software
• PlayStation 4 system software
• PlayStation 5 system software

SYSGO

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

Tandem Computers, Compaq, Hewlett-Packard, Hewlett Packard Enterprise

• NonStop OS – runs on HPE's NonStop line of servers

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 (and later DOS/VS and DOS/VSE) 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.

Weston Embedded Solutions

• μC/OS-II – a small pre-emptive priority based multi-tasking kernel
• μC/OS-III – a small pre-emptive priority based multi-tasking kernel, with unlimited number of tasks and priorities, and round-robin scheduling
• Cesium RTOS - commercial continuation of Micrium's μC/OS-III forked from the open-sources release

Wind River Systems

• VxWorks – Small footprint, scalable, high-performance RTOS for embedded microprocessor based systems.

Zilog

• Z80-RIO

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."

For Elektronika BK

• ANDOS
• CSI-DOS
• MK-DOS

Non-standard language-based

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

Other proprietary non-Unix-like

• Operating system for Эльбрус-1 (Elbrus-1) and Эльбрус-2 – used for application, job control, system programming, implemented in uЭль-76 (AL-76).
• Business Operating System (BOS) – developed to be ported across microcomputers.
• 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 shuttle.
• 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 (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—an operating system developed by Pyramid Technology for its MIPS-based systems)
• 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 Mac OS X)
• RISC iX – derived from BSD 4.3, by Acorn computers, for their ARM family of machines
• RISC/os (a port by MIPS Technologies of 4.3BSD for its MIPS-based computers)
• RMX
• SCO UNIX (from SCO, bought by Caldera who renamed themselves SCO Group)
• SINIX (a port by SNI of Unix to the MIPS architecture)
• Solaris (from Sun, bought by Oracle; a 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 and others)
• 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.)
• Zenix, Zenith corporations Unix (a popular USA electronics maker at the time)

Non-proprietary

Unix or Unix-like

• MINIX (study OS developed by Andrew S. Tanenbaum in the Netherlands)
• Berkeley Software Distribution (BSD), a variant of Unix originally for DEC PDP-11 and VAX hardware)
  • FreeBSD (one of the outgrowths of UC Regents' abandonment of CSRG's 'BSD Unix')
    • DragonFlyBSD, forked from FreeBSD 4.8
    • MidnightBSD, forked from FreeBSD 6.1
    • GhostBSD
    • TrueOS (previously known as PC-BSD), made for desktop/laptop usage, now discontinued
    • NomadBSD, a project aiming to tend FreeBSD to desktop/laptop needs
  • NetBSD (an embedded device BSD variant)
    • OpenBSD forked from NetBSD
      • Bitrig forked from OpenBSD, discontinued
      • FuguIta, a live OpenBSD fork by a Japanese developer
  • Darwin, created by Apple using code from NeXTSTEP, FreeBSD, and NetBSD
• GNU (also known as GNU/Hurd)
• Linux (see also List of Linux distributions) (alleged to be GNU/Linux see GNU/Linux naming controversy)
  • Android
    • Android-x86
      • Remix OS
    • EulerOS - Linux commercial distribution for cloud based software by Huawei
      • openEuler - open-source community version of EulerOS
      • NestOS - open-source cloud based operating system based on EulerOS, contributed by openEuler community
• Redox (written in Rust)
• OpenSolaris
  • illumos, contains original Unix (SVR4) code derived from the OpenSolaris (discontinued by Oracle in favor of Solaris 11 Express)
    • 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 (Real-Time Executive for Multiprocessor Systems)
• Syllable Desktop
• VSTa
• Plurix (or Tropix) (by Federal University of Rio de Janeiro – UFRJ)
• TUNIS (University of Toronto)
• Xv6 - a simple Unix-like teaching operating system from MIT
• SerenityOS - aims to be a modern Unix-like operating system, yet with a look and feel that emulates 1990s operating systems such as Microsoft Windows and the classic Mac OS.

Non-Unix

• Cosmos – written in C#
• EmuTOS - open source Atari TOS variant
• FreeDOS – open source MS-DOS variant
• Genode – operating system framework for microkernels (written in C++)
• Google Fuchsia
• Haiku – open source inspired by BeOS, in development
• Incompatible Timesharing System (ITS) – written in the MIDAS macro assembler language for the PDP-6 and PDP-10 by MIT students
• LiteOS
• MagiC - open source Atari TOS variant
• OpenHarmony - LiteOS kernel and kernel add-ons side of the kernel tree under Kernel Abstract Layer (KAL) structure
• Uniproton real-time operating system for ultra-low latency and adaptable mixed-critical deployment capabilities contributed by openEuler community and also part of OpenHarmony add-on kernel
• 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 XP, Windows 2000, etc.); in development
• SharpOS – written in .NET C#
• Visopsys – written in C and assembly 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
  • 9front, a derivative open-source project made to resurrect Plan 9 to passionate developers
• Research Unix

Non-Unix

• Amoeba – research OS by Andrew S. Tanenbaum
• Barrelfish
• Croquet
• EROS – microkernel, capability-based
  • CapROS – microkernel EROS successor
• Harmony – realtime, multitasking, multiprocessing message-passing system developed at the National Research Council of Canada.
• 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
• Thoth – realtime, multiprocess message-passing system developed at the University of Waterloo.
• 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)

Main article: Disk operating system

• 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–6.22 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 1.1, 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, 7.60, 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 (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 (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
  • DESQview + QEMM 386 multi-tasking user interface for DOS
  • DESQView/X (X-windowing GUI for DOS)

Network operating systems

Main article: Network operating system

• 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 (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
• SONiC
• TurboDOS – by Software 2000, Inc.

Generic, commodity, and other

• BLIS/COBOL
• A2 formerly named Active Object System (AOS), and then Bluebottle (a concurrent and active object update to the Oberon operating system)
• BS1000 by Siemens
• BS2000 by Siemens, now BS2000/OSD from Fujitsu Siemens (formerly Siemens Nixdorf Informationssysteme)
• BS3000 by Siemens (rebadging of Fujitsu's MSP operating system)
• Contiki for various, mostly 8-bit systems, including the Apple II series, the Atari 8-bit family, and some Commodore machines.
• FLEX9 (by Technical Systems Consultants (TSC) for Motorola 6809 based machines; successor to FLEX, which was for Motorola 6800 CPUs)
• Graphics Environment Manager (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 Technical Systems Consultants (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 x86, ARM 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 in Pascal)
• 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
• 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.)

Hobby

Main article: Hobbyist operating system

• 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
• 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
• MMURTL (Message based MUltitasking Real-Time kerneL, pronounced 'Myrtle')
• SerenityOS
• SerpaeOS
• TempleOS – biblical-themed OS, written in HolyC by Terry Davis
• ToaruOS
  • PonyOS

Embedded

Mobile operating systems

Main article: Mobile operating system

• DIP DOS on Atari Portfolio
• Embedded Linux (see also Linux for mobile devices)
  • Android
    • CalyxOS
    • DivestOS
    • EMUI
    • Flyme OS
    • GrapheneOS
    • LineageOS
    • MIUI
    • Replicant
    • See also List of custom Android distributions
  • Firefox OS
    • KaiOS
  • Ångström distribution
  • Familiar Linux
  • Mæmo based on Debian deployed on Nokia's Nokia 770, N800 and N810 Internet Tablets.
  • OpenZaurus
  • webOS from Palm, Inc., later Hewlett-Packard via acquisition, and most recently at LG Electronics through acquisition from Hewlett-Packard
  • Access Linux Platform
  • bada
  • Openmoko Linux
  • OPhone
  • MeeGo (from merger of Maemo & Moblin)
  • Mobilinux
  • MotoMagx
  • Qt Extended
  • Sailfish OS
  • Tizen (earlier called LiMo Platform)
  • Ubuntu Touch
  • PostmarketOS
• Inferno (distributed OS originally from Bell Labs)
• Magic Cap
• MS-DOS on Poqet PC, HP 95LX, HP 100LX, HP 200LX, HP 1000CX, HP 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
  • EPOC
• 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
• DSPnano RTOS
• iOS
  • watchOS
  • tvOS
• iPod software
• iPodLinux
• iriver clix OS
• RockBox
• BlackBerry OS
• PEN/GEOS, GEOS-SC, GEOS-SE
• Palm OS
• Symbian platform (successor to Symbian OS)
• BlackBerry 10
• HarmonyOS

Routers

• CatOS – by Cisco Systems
• Cisco IOS – originally Internetwork Operating System by Cisco Systems
• DNOS – by DriveNets
• Inferno – distributed OS originally from Bell Labs
• IOS-XR – by Cisco Systems
• JunOS – by Juniper Networks
• LCOS – by LANCOM Systems
• Linux
  • OpenWrt
    • DD-WRT
    • LEDE
    • Gargoyle
    • LibreCMC
  • Zeroshell
• FTOS – by Force10 Networks
• FreeBSD
• Huawei VRP (Versatile Routing Platform) that many Huawei devices operate on
• LiteOS
• HarmonyOS
  • OpenHarmony
• EulerOS
  • openEuler
• m0n0wall
• OPNsense
• pfsense
• List of wireless router firmware projects

Other embedded

• Apache Mynewt
• ChibiOS/RT
• Contiki
• ERIKA Enterprise
• eCos
• NetBSD
• Nucleus RTOS
• NuttX
• Minix
• NCOS
• freeRTOS, openRTOS, safeRTOS
• Fuchsia
• OpenEmbedded (or Yocto Project)
• OpenHarmony
• pSOS (Portable Software On Silicon)
• PX5 RTOS
• QNX – Unix-like real-time operating system, aimed primarily at the embedded systems market.
• REX OS – microkernel; usually an embedded cell phone OS
• RIOT
• ROM-DOS
• TinyOS
• ThreadX
• RT-Thread
• DSPnano RTOS
• Windows IoT – formerly Windows Embedded
  • Windows CE
  • Windows IoT Core
  • Windows IoT Enterprise
• Wind River VxWorks RTOS.
• Wombat – microkernel; usually real-time embedded
• Zephyr
• LiteOS

LEGO Mindstorms

• brickOS
• leJOS

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 – Custom microprogrammable hardware, 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
• V – from Stanford, early 1980s
• HarmonyOS NEXT
• Google Fuchsia
• Phantom OS

See also

• Comparison of operating systems
• Comparison of real-time operating systems
• Timeline of operating systems

Category links

• Operating systems
  • Embedded operating systems
  • Real-time operating systems

External links

• "List of Operating Systems". www.operating-system.org.