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[[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, here they are listed alphabetically and many are listed on the [[List of operating systems by platform]] article.
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[[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.
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{{CompactTOC}}
  
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==A==
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==Proprietary==
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*'''AmigaOS''
  
  +
===[[Acorn Computers]]===
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*'''
  
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*[[Acorn MOS]]
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==B==
  
  +
*[[ARX (operating system)|ARX project]]
  +
*[[Arthur (operating system)|Arthur OS]]
  +
*[[RISC OS 2]]
  +
*[[RISC OS]] 3.0 - 3.7
  +
*[[RISC OS]] 4.02 - 4.42
  +
*[[RISC OS]] 5.00 - 5.16
  +
  +
  +
===[[Amiga Inc.]]===
  +
*[[AmigaOS]]
  +
**[[AmigaOS versions|AmigaOS 1.0-3.9]] (68k)
  +
**[[AmigaOS 4]] (PowerPC)
  +
**<!--[[AmigaOS 5]]
  +
**[[Amiga Anywhere 2]]-->
  +
* [[Amiga Unix]] (aka Amix)
  +
  +
===[[Apollo Computer]]===
  +
* AEGIS
  +
* [[Domain/OS]] One of the first network-based systems. Ran on [[Apollo/Domain]] hardware. Later bought by [[Hewlett-Packard]].
  +
* vikek OS
  +
  +
===[[Apple Inc.]]===
  +
  +
  +
  +
For [[Apple II]]
  +
*[[Apple DOS]]
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*[[UCSD Pascal]]
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*[[ProDOS]]
  +
*[[GS/OS]]
  +
  +
For [[Apple III]]
  +
*[[Apple SOS|SOS]] (Sophisticated Operating System)
  +
  +
For [[Apple Lisa]]
  +
*Lisa OS
  +
  +
For [[Apple Newton]]
  +
*[[Newton OS]]
  +
  +
Classic [[Mac OS]]
  +
*[[History of Mac OS#System 1, 2, 3 & 4|System Software 1]]
  +
*[[History of Mac OS#System 1, 2, 3 & 4|System Software 2]]
  +
*[[History of Mac OS#System 1, 2, 3 & 4|System Software 3]]
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*[[History of Mac OS#System 1, 2, 3 & 4|System Software 4]]
  +
*[[History of Mac OS#System Software 5|System Software 5]]
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*[[System 6]]
  +
*[[System 7 (Macintosh)|System 7]] (codenamed "Big Bang")
  +
*[[Mac OS 8]]
  +
*[[Mac OS 9]]
  +
  +
[[Unix-like]] operating systems
  +
*For [[Macintosh]] Computers
  +
**For 68k CPUs
  +
***[[A/UX]]
  +
**For [[PowerPC]] CPUs
  +
***[[MkLinux]]
  +
**For [[PowerPC]] and [[Intel]] CPUs
  +
***[[Mac OS X]]
  +
****[[Mac OS X v10.0]] (aka "Cheetah")
  +
****[[Mac OS X v10.1]] (aka "Puma")
  +
****[[Mac OS X v10.2]] (aka "Jaguar")
  +
****[[Mac OS X v10.3]] (aka "Panther")
  +
****[[Mac OS X v10.4]] (aka "Tiger")
  +
****[[Mac OS X v10.5]] (aka "Leopard")
  +
****[[Mac OS X v10.6]] (aka "Snow Leopard")
  +
****[[Mac OS X Server]]
  +
*For [[iPhone]]/[[iPod Touch]]/[[iPad]]
  +
**[[iPhone OS]]
  +
  +
===[[Atari]]===
  +
*[[Atari DOS]] (for 8-bit computers)
  +
*[[Atari TOS]]
  +
*[[MiNT#TOS goes multitasking - Enter MultiTOS|Atari MultiTOS]]
  +
  +
===[[BAE Systems]]===
  +
* [[XTS-400]]
  +
  +
===[[Be Inc.]]===
  +
*[[BeOS]]
  +
**[[BeIA]]
  +
**[[Dano (BeOS)|BeOS r5.1d0]]
  +
***[[magnussoft ZETA]] (based on [[Dano (BeOS)|BeOS r5.1d0]] source code, developed by [[yellowTAB]])
  +
*Blue Eyed OS
  +
*Cosmoe
  +
  +
===[[Burroughs Corporation]]===
  +
*[[Burroughs MCP]]
  +
  +
===[[Control Data Corporation]]===
  +
* COS (Chippewa Operating System)
  +
** SIPROS (for Simultaneous Processing Operating System)
  +
** [[SCOPE (software)|SCOPE]] (Supervisory Control Of Program Execution)
  +
** MACE (Mansfield and Cahlander Executive)
  +
*** [[KRONOS]] (Kronographic OS)
  +
**** [[NOS (software)|NOS]] (Network Operating System)
  +
***** NOS/BE NOS Batch Environment
  +
  +
===[[Convergent Technologies (Unisys)|Convergent Technologies]]===
  +
* [[Convergent Technologies Operating System]] (later acquired by [[Unisys]])
  +
  +
===[[Data General]]===
  +
*[[RDOS]] Real-time Disk Operating System, with variants: RTOS and DOS (not related to [[IBM PC]] [[MS DOS|DOS]]).
  +
*[[Data General AOS|AOS]] for 16-bit [[Data General Eclipse]] computers and [[Data General AOS|AOS/VS]] for 32-bit (MV series) Eclipses, MP/AOS for [[microNOVA]]-based computers
  +
*[[DG/UX]]
  +
  +
===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.
  +
  +
===Digital Research Inc===
  +
  +
*[[CP/M|Control Program/Monitor (CP/M)]]
  +
**[[CP/M-80]] CP/M for Intel 8080/8085 and [[Zilog Z80]]
  +
**[[CP/M-86]] CP/M for Intel 8088/86
  +
**[[CP/M-68k]] CP/M for [[Motorola 68000]]
  +
**[[CP/M-8000]] CP/M for [[Zilog Z8000]]
  +
**[[Personal CP/M]]
  +
**[[CP/NET]]
  +
*[[DR-DOS]] (Digital Research's [later Novell, Caldera, ...] DOS variant, based on [[CP/M]] descendants)
  +
**[[Multiuser DOS|Concurrent DOS]] (Digital Research's first multiuser DOS variant)
  +
**[[Multiuser DOS]] (Digital Research's [later CCI's. Real's/...] multiuser DOS variant)
  +
  +
===Digital/Tandem Computers/Compaq/HP===
  +
*[[OS/8]]
  +
*[[Incompatible Timesharing System|ITS]] (for the [[PDP-6]] and [[PDP-10]])
  +
*[[Multi-Programming Executive]] (from [[Hewlett-Packard|HP]])
  +
*[[TOPS-10]] (for the PDP-10)
  +
*[[WAITS]] (for the PDP-6 and PDP-10)
  +
*[[TOPS-20|TENEX]] (from [[BBN]], for the PDP-10)
  +
*[[TOPS-20]] (for the PDP-10)
  +
*[[RSTS/E]] (multi-user time-sharing OS for [[PDP-11]]s)
  +
*[[RSX-11]] (multiuser, multitasking OS for PDP-11s)
  +
*[[RT-11]] (single user OS for PDP-11)
  +
*[[Virtual Memory System|VMS]] (originally by [[Digital Equipment Corporation|DEC]], now by [[Hewlett-Packard|HP]]) for the [[VAX]] mini-computer range, [[DEC Alpha|Alpha]] and Intel [[Itanium 2]]; later renamed OpenVMS)
  +
*[[Domain/OS]] (originally ''Aegis'', from [[Apollo Computer]] who were bought by HP)
  +
*[[Real Time Executive|RTE]] HP's Real Time Executive (ran on the HP 1000)
  +
*[[Time Share Basic|TSB]] HP's Time Share Basic (yes, it was an operating system, ran on the HP 2000 series)
  +
*[[Tru64 UNIX|Digital UNIX]] (derived from OSF/1, became HP's [[Tru64 UNIX]])
  +
*[[HP-UX]]
  +
*[[Ultrix]]
  +
*NonStop Kernel (Originally from [[Tandem Computers]] for their line of fault-tolerant platforms; originally called Guardian). It supports concurrent execution of:
  +
**Guardian
  +
**OSS (POSIX-compliant Open System Services)
  +
  +
=== [[ENEA AB]] ===
  +
*[[Operating System Embedded|OSE]] Flexible, small footprint, high-performance RTOS for control processors
  +
*[[OSEck]] Small footprint, scalable, high-performance RTOS for DSPs
  +
*[[OSE ɛ]] Small footprint, scalable, high-performance RTOS for microcontrollers
  +
  +
===[[Fujitsu]]===
  +
*[[FM Towns#Operating system|Towns OS]]
  +
  +
===[[Systems Engineering Laboratories|Gould CSD (Computer System Division)]]===
  +
*UTX-32, Unix based OS
  +
  +
===[[Green Hills Software]]===
  +
*[[Integrity (operating system)|INTEGRITY]] Reliable Operating system
  +
*[[INTEGRITY-178B]] A DO-178B certified version of [[Integrity (operating system)|INTEGRITY]].
  +
*''[[Green Hills Software#Real-time operating systems (RTOS)|µ-velOSity]]'' A lightweight [[microkernel]].
  +
  +
===[[Hewlett-Packard]]===
  +
*[[HP Real-Time Environment]]; ran on HP1000 series computers.
  +
*[[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.
  +
  +
===[[Honeywell]]===
  +
* OLERT-E; Online Executive for Real Time. Ran on Honeywell DDP-516 computers.
  +
* [[General Comprehensive Operating System|GCOS]]
  +
* [[Multics]]
  +
  +
===[[Intel Corporation]]===
  +
*[[RMX_(operating_system)|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 1980'ies on their Intellec Microcomputer Development System and clones. ISIS-II worked with 8&nbsp;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]]===
  +
*[[OS/360 and successors]] on IBM 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]] (Multi-Programming Fixed Tasks, had 15 fixed size partitions defined at boot time)
  +
***[[MVT]] (Multi-Programming Variable Tasks, had up to 15 partitions defined dynamically)
  +
**OS/VS (The official port of OS/360 targeted for the [[System/370]] [[virtual memory]] architecture. ''"OS/370"'' is not correct name. 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 OS/MFT)
  +
***OS/VS2 (Operating System/Virtual Storage 2, Virtual-memory version of OS/MVT)
  +
****OS/VS2 R2 (called [[Multiple Virtual Storage]], '''MVS''', eliminated any need for VS1)
  +
**MVS/SP (MVS System Product)
  +
**[[MVS/XA]] (MVS/SP V2. MVS supported eXtended Architecture, [[31bit]] addressing)
  +
**[[MVS/ESA]] (MVS supported Enterprise System Architecture, horizontal addressing extensions: data only address spaces called Dataspaces)
  +
**[[OS/390]] (Upgrade from MVS, with an additional [[Unix-like]] environment.)
  +
**[[z/OS]] (OS/390 supported [[z/Architecture]], [[64bit]] addressing.)
  +
  +
*[[DOS/360 and successors]] on IBM 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'''). First commonly available OS for System/360 due to problems in the OS/360 Project. Multi-programming system with up to 3 partitions.)
  +
***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]] (upgrade of DOS/VS. Still had fixed size processing partitions, but up to 14 partitions.)
  +
**[[VSE/SP]] (renamed from DOS/VSE.)
  +
**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. Now supports 64 bit addresses, multiprocessing, multiprogramming, SNA, TCP/IP, and some virtual machine features in support of Linux workloads. (All DOS ref. IBM website))
  +
  +
*[[CP/CMS]] and successors on IBM mainframes (Control Program / Cambridge Monitor System, '''[[virtual machine]]''' operating system, [[History of CP/CMS|VM line]])
  +
**[[CP-40]]/CMS (for [[System/360]] Model 40)
  +
**[[CP-67]]/CMS (for System/360 Model 67)
  +
**[[VM/370]] [[Virtual machine|Virtual Machine]] / Conversational Monitor System, [[VM (operating system)]] for System/370 with virtual memory.
  +
**VM/XA [[VM (operating system)]] eXtended Architecture for [[System/370]] with extended [[virtual memory]].
  +
**VM/ESA [[Virtual machine|Virtual Machine]] /Extended System Architecture, added 32 bit addressing to VM series.
  +
**[[z/VM]] z/Architecture version of the VM OS (64 bit addressing).
  +
  +
*TPF Line on IBM mainframes (real-time operating system, largely used by airlines)
  +
**[[Airline Control Program|ACP]] (Airline Control Program)
  +
**[[Transaction Processing Facility|TPF]] (Transaction Processing Facility)
  +
**[[z/TPF]] ([[z/Architecture]] extension)
  +
  +
*[[Unix-like]] on IBM mainframes
  +
**[[UTS (Mainframe UNIX)|UTS]]
  +
**[[AIX/370]]
  +
**[[AIX/ESA]]
  +
**[[Linux]] (Linux on System z, z/Linux)
  +
**[[OpenSolaris]] (OpenSolaris for IBM System z)
  +
  +
* Others on IBM mainframes
  +
**[[IBSYS]] (tape based operating system for [[IBM 7090]] and [[IBM 7094]])
  +
**[[Compatible Time-Sharing System|CTSS]] (The Compatible Time-Sharing System developed at MIT's Computation Center)
  +
**[[RTOS/360]] (Real Time Operating System, run on 5 NASA custom System/360/75s. A mash up by the Federal Systems Division of the MFT system management, PCP basic kernel and file system, with MVT task management and FSD custom real time kernel extensions and error management. The pinnacle of OS/360 development{{cite}}.)
  +
**[[Michigan Terminal System|MTS]] (Michigan Terminal System for IBM System/360)
  +
**[[TSS/360]] (Time Sharing System for IBM System/360)
  +
**[[MUSIC/SP]] (developed by [[McGill University]] for IBM System/370)
  +
**[[IJMON]] (A bootable serial I/O monitor for loading programs for [[IBM 1400]] and [[IBM 1800]].)
  +
  +
*[[IBM Series/1]]
  +
**[[EDX]] (Event Driven Executive)
  +
**[[RPS]] (Realtime Programming System)
  +
  +
*[[IBM 8100]]
  +
**[[IBM 8100 DPCX|DPCX]] (Distributed Processing Control eXecutive)
  +
**[[IBM 8100 DPPX|DPPX]] (Distributed Processing Programming Executive)
  +
  +
*[[IBM System/3]]
  +
**DMS (Disk Management System)
  +
  +
*[[IBM System/34]], [[IBM System/36]]
  +
**SSP (System Support Program)
  +
  +
*[[IBM System/38]]
  +
**[[CPF]] (Control Program Facility)
  +
  +
*[[IBM System/88]]
  +
**[[Stratus VOS]] (developed by [[Stratus Technologies|Stratus]], and used for IBM [[System/88]], [[Original 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 (operating system)|AIX]]''' (Advanced Interactive eXecutive, a System V Unix version)
  +
**[[Academic Operating System|AOS]] (a BSD Unix version), not related to [[Data General]] AOS
  +
  +
*[[IBM PC]] and successors on [[x86 architecture]]
  +
**'''[[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.x, 7, 2000
  +
**'''[[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)
  +
  +
*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 Computer Systems|Sequent]], and used for IBM [[NUMA-Q]] too.)
  +
  +
===[[International Computers Limited]]===
  +
*[[J (operating system)|J]] and [[MultiJob]] for the System 4 series mainframes
  +
*[[GEORGE (operating system)|GEORGE]] 2/3/4 GEneral ORGanisational Environment, used by [[International Computers Limited|ICL]] [[ICT 1900|1900]] series mainframes
  +
*[[Executive (operating system)|Executive]], used on the 290x range of minicomputers
  +
*[[TME (operating system)|TME]], used on the ME29 minicomputer
  +
*[[ICL VME]], including early variants VME/B VME/K, appearing on the [[ICL 2900 Series]] and Series 39 mainframes
  +
  +
===[[LynuxWorks]] (originally Lynx Real-time Systems)===
  +
*[[LynxOS]]
  +
  +
===Micrium Inc.===
  +
*[[MicroC/OS-II]] (Small pre-emptive priority based multi-tasking kernel)
  +
  +
===[[Microsoft]]===
  +
*[[Xenix]] (licensed version of Unix; licensed to [[Santa Cruz Operation|SCO]] in 1987)
  +
*[[MSX-DOS]] (developed by MS Japan for the MSX 8-bit computer)
  +
*[[MS-DOS]] (developed jointly with IBM, versions 1.0&ndash;6.22)
  +
**[[Windows 1.0]] (Windows 1 - Based on Visi-On)
  +
**[[Windows 2.0]] (Windows 2)
  +
**[[Windows 3.0]] (Windows 3 - Is the first version of Windows to make substantial commercial impact)
  +
**[[Windows 3.1x]] (Windows 3.1)
  +
**[[Windows 3.2]] (Chinese-only release)
  +
*[[Windows 9x]]
  +
**[[Windows 95]] (Windows 4) (codename: Chicago)
  +
**[[Windows 98]] (Windows 4.1) (codename: Memphis)
  +
**[[Windows Millennium Edition]] (Windows Me - Windows 4.9)
  +
*[[OS/2]] (developed jointly with IBM)
  +
*[[Windows NT]]
  +
**[[Windows NT 3.1]] (OS/2 3.0 - Windows 3.1)
  +
**[[Windows NT 3.5]] (Windows 3.5)
  +
**[[Windows NT 3.51]] (Windows 3.51)
  +
**[[Windows NT 4.0]] (Windows 4)
  +
**[[Windows 2000]] (Windows NT 5.0 - Windows 5)
  +
**[[Windows XP]] (Windows NT 5.1 - Windows 5.1) (codename: Whistler)
  +
**[[Windows Server 2003]] (Windows NT 5.2 - Windows 5.2) (codename: Whistler Server)
  +
**[[Windows Fundamentals for Legacy PCs]]
  +
**[[Windows Vista]] (Windows NT 6.0 - Windows 6) (codename: Longhorn)
  +
**[[Windows Home Server]]
  +
**[[Windows Server 2008]] (Windows NT 6.0 - Windows 6) (codename: Longhorn Server)
  +
**[[Windows 7]] (Windows 6.1 - previously codenamed Blackcomb, then Vienna)
  +
**[[Windows Preinstallation Environment|Windows Preinstallation Environment (WinPE)]]
  +
*[[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)
  +
*[[Singularity (operating system)|Singularity]] - A research operating system written mostly in [[managed code]] ([[C Sharp (programming language)|C#]])
  +
*[[Midori (operating system)|Midori]] - A managed code operating system
  +
  +
===[[MontaVista Software]]===
  +
*MontaVista Linux
  +
**MontaVista Professional Edition
  +
**MontaVista Carrier Grade Edition
  +
**MontaVista [[Mobilinux]]
  +
  +
===[[NCR Corporation]]===
  +
*[[Transaction Management eXecutive|TMX]] - Transaction Management eXecutive
  +
  +
===[[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.
  +
*[[Novell Open Enterprise Server|Open Enterprise Server]], the successor to NetWare.
  +
*[[OpenSUSE]], SUSE operating system (formerly SuSe and s.u.s.e)
  +
  +
  +
===Quadros Systems===
  +
* [[RTXC Quadros]] RTOS proprietary C-based RTOS used in embedded systems
  +
  +
===QANTEL===
  +
*[[BEST]] - Business Executive System for Timesharing
  +
  +
===[[Radio Corporation of America|RCA]]===
  +
*[[Time Sharing Operating System|TSOS]], first OS supporting virtual addressing of the main storage and support for both timeshare and batch interface
  +
  +
===RoweBots===
  +
*[[Unison RTOS]] Ultra Tiny Embedded Linux Compatible RTOS
  +
*[[DSPnano RTOS]] Ultra Tiny Embedded Linux Compatible RTOS
  +
*[[Unison RTOS|Unison/Reliant V3]] [[pSOS]] derivative RTOS
  +
  +
===[[Santa Cruz Operation|SCO]] / [[The SCO Group]]<ref>
  +
{{ cite web
  +
| url = http://williambader.com/museum/dell/xenixhistory.html
  +
| title = SCO History by William Bader
  +
| accessdate = 2010-03-12 }}
  +
</ref>===
  +
*[[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 OpenServer|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 OpenServer|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 [[Santa Cruz Operation|SCO]] as SVR5
  +
  +
=== Scos ===
  +
*Scos 1
  +
**Scos 1.2
  +
**Scos 1.5
  +
*Scos 2.0
  +
**Scos 2.5
  +
*Scos 3
  +
*Scos 4
  +
*Scos 5
  +
*Scos 6 (Latest Stable Version)
  +
  +
  +
===SDS (Scientific Data Systems)===
  +
*[[CP]] Control Program. SDS later acquired by Xerox, then Honeywell.
  +
  +
===SEL ([[Systems Engineering Laboratories]])===
  +
*Real Time Monitor (RTM)
  +
*MPX-32
  +
  +
=== [[SYSGO]] ===
  +
* [[PikeOS]] is a certified real time operating system for safety and security critical embedded systems
  +
  +
=== [[TmaxSoft]] ===
  +
* [[Tmax Window]]
  +
  +
=== TRON Project ===
  +
*[[TRON Project|TRON]] (open [[real-time operating system]] [[Kernel (computing)|kernel]])
  +
  +
=== Unicoi Systems ===
  +
*[[Fusion RTOS]] highly prolific, license free Real-time operating system.
  +
*[[DSPOS]] was the original project which would become the royalty free Fusion RTOS.
  +
  +
=== [[Unisys]]===
  +
*[[Unisys OS 2200 operating system]]
  +
  +
=== [[UNIVAC]] (later Unisys)===
  +
*[[EXEC I]]
  +
*[[EXEC II]]
  +
*[[EXEC 8]] Ran on 1100 series.
  +
*[[VS/9]], successor to [[Time Sharing Operating System|RCA TSOS]]
  +
  +
===[[Wavecom]]===
  +
*[[Open AT OS]]
  +
  +
=== Wang Laboratories ===
  +
*[[2200T]] Wang BASIC based system for the multi-user, 2200T systems. Products included a system called Personal Computer before the term was made more popular with IBM products.
  +
*[[2200VP/MVP]] Wang BASIC based system for the higher performance, 2200VP/MVP multi-user systems. Contained sophisticated micro-code programming for high performance operation.
  +
*[[WPS]] Wang Word Processing System. Micro-code based system. Very clever and productive system developed by Harold Kaplow while at Wang. Eventually phased out by the PC and Word Perfect.
  +
*[[OIS]] Wang Office Information System. Successor to the WPS. Combined the WPS and VP/MVP systems. Harold Kaplow was its principal architect. Eventually phased out by the 2200VS.
  +
*[[2200VS]] IBM assembler instruction set microcode emulation. Supported the Wang 2200VS high-performance, multi-user systems. Designed to be a COBOL developers dream machine. Included some of the OIS operating system code. Eventually phased out by the UNIX operating system.
  +
  +
=== Wind River Systems ===
  +
*[[VxWorks]] Small footprint, scalable, high-performance RTO
  +
===Other===
  +
====Lisp-based====
  +
*[[Symbolics]] [[Genera (operating system)|Genera]] written in a systems dialect of the [[Lisp (programming language)|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]].
  +
*The [[Xerox]] 1100 series of Lisp machines ran an operating system written in [[Interlisp]] that was also ported to virtual machine called "Medley."
  +
*[[Lisp Machines, Inc.]] also known as LMI, also ran an operating system based on [[MIT]]'s [[Lisp Machine Lisp]].
  +
  +
====Non-standard language-based====
  +
*The [[Mesa programming language]] was used to implement the [[Pilot (operating system)|Pilot]] operating system, used in [[Xerox Star]] workstations.
  +
*[[PERQ]] Operating System (POS) was written in PERQ [[Pascal (programming language)|Pascal]].
  +
  +
====Other proprietary non-Unix-like====
  +
*[[EOS (operating system)|EOS]]; developed by [[ETA Systems]] for use in their [[ETA-10]] line of [[supercomputer]]s
  +
*EMBOS; developed by [[Elxsi]] for use on their [[mini-supercomputer]]s
  +
*[[GCOS (operating system)|GCOS]] is a proprietary Operating System originally developed by [[General Electric]]
  +
*[[PC-MOS/386]]; DOS-like, but multiuser/multitasking
  +
*[[SINTRAN III]]; an operating system used with [[Norsk Data]] computers.
  +
*[[THEOS]]
  +
*[[TRS-DOS]]; A floppy-disk-oriented OS supplied by Tandy/Radio Shack for their Z80-based line of personal computers.
  +
*[[NewDos/80]]; A third-party OS for Tandy's TRS-80 personal computers.
  +
*TX990/TXDS, [[DX10]] and DNOS; proprietary operating systems for [[TI-990]] minicomputers
  +
*[[MAI Basic Four]]; An OS implementing [[Business Basic]] from MAI Systems.
  +
*[[Michigan Terminal System]]; Developed by a group of American universities for IBM 360 series mainframes
  +
*[[MUSIC/SP]]; an operating system developed for the S/370, running normally under VM
  +
*[[SkyOS]]; commercial desktop OS for PCs
  +
*[[TSX-32]]; a 32-bit operating system for x86 platform.
  +
*OS ES; an operating system for [[ES EVM]]
  +
*Prolog-Dispatcher; used to control Soviet [[Buran]] space ship.
  +
  +
====Other proprietary Unix-like and POSIX-compliant====
  +
*[[Domain/OS|Aegis]] ([[Apollo Computer]])
  +
*[[Amiga Unix]] (Amiga ports of Unix System V release 3.2 with Amiga A2500UX and SVR4 with Amiga A3000UX. Started in 1989, last version was in 1992)
  +
*[[Clix]] (Intergraph's System V implementation)
  +
*[[Coherent (operating system)|Coherent]] ([[Unix-like]] OS from Mark Williams Co. for PC class computers)
  +
*[[DC/OSx]] (DataCenter/OSx was an operating system for [[MIPS architecture|MIPS]] based systems developed by [[Pyramid Technology]])
  +
*[[DG/UX]] (Data General Corp)
  +
*[[DNIX]] from [[DIAB]]
  +
*[[DSPnano RTOS]] (POSIX nanokernel, DSP Optimized, Open Source)
  +
*''Idris'' workalike from Whitesmiths
  +
*[[INTERACTIVE UNIX]] (a [[porting|port]] of the [[UNIX System V]] [[operating system]] for [[Intel x86]] by [[INTERACTIVE Systems Corporation]])
  +
*[[IRIX]] from [[Silicon Graphics|SGI]]
  +
*[[MeikOS]]
  +
*[[NeXTSTEP]] (developed by [[NeXT]]; a Unix-based OS based on the [[Mach kernel|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 (programming language)|C]])
  +
*[[OSF/1]] (developed into a commercial offering by [[Digital Equipment Corporation]])
  +
*[[OpenStep]]
  +
*[[QNX]] (POSIX, microkernel OS; usually a real time embedded OS)
  +
*[[Rhapsody (operating system)|Rhapsody]] (an early form of Mac OS X)
  +
*[[RISC/os]] (a port by [[MIPS Technologies|MIPS]] of [[4.3BSD]] to the [[RISC]] [[MIPS architecture]])
  +
*[[RMX]]
  +
*[[SCO UNIX]] (from [[Santa Cruz Operation|SCO]], bought by Caldera who renamed themselves [[SCO Group]])
  +
*[[SINIX]] (a port by [[Siemens Nixdorf Informationssysteme|SNI]] of [[Unix]] to the [[RISC]] [[MIPS architecture]])
  +
*[[Solaris Operating System|Solaris]] (Sun's System V-based replacement for SunOS)
  +
*[[SunOS]] (BSD-based Unix system used on early Sun hardware)
  +
*[[SUPER-UX]] (a port of [[UNIX System V|System V Release 4.2MP]] with features adopted from [[Berkeley Software Distribution|BSD]] and [[Linux]] for [[NEC Corporation|NEC]] [[SX architecture]] [[supercomputer]]s)
  +
*[[System V]] (a release of AT&T Unix, 'SVR4' was the 4th minor release)
  +
*[[Microport|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)
  +
*[[Unison RTOS]] (Multicore RTOS with DSP Optimization)
  +
  +
==Non-proprietary==
  +
===[[Unix-like]]===
  +
====Research Unix-like and other POSIX-compliant====
  +
*[[Minix]] (study OS developed by [[Andrew S. Tanenbaum]] in the [[Netherlands]])
  +
*[[Plan 9 from Bell Labs|Plan 9]] (distributed OS developed at [[Bell Labs]], based on original Unix design principles yet functionally different and going much further)
  +
**[[Inferno (operating system)|Inferno]] (distributed OS derived from [[Plan 9 from Bell Labs|Plan 9]], originally from Bell Labs)
  +
**Plan B (distributed OS derived from [[Plan 9 from Bell Labs|Plan 9]] and Off++ microkernel)
  +
*[[Unix]] (OS developed at Bell Labs ca 1970 initially by [[Ken Thompson (computer programmer)|Ken Thompson]])
  +
*[[Xinu]], (Study OS developed by [[Douglas E. Comer]] in the [[USA]])
  +
  +
====[[Free software|Free]]/[[Open source]] Unix-like====
  +
*[[Berkeley Software Distribution|BSD]] (Berkeley Software Distribution, a variant of Unix for [[Digital Equipment Corporation|DEC]] [[VAX]] hardware)
  +
**[[FreeBSD]] (one of the outgrowths of UC Regents' abandonment of [[CSRG]]'s 'BSD Unix')
  +
**[[NetBSD]] (one of the outgrowths of UC Regents' abandonment of [[CSRG]]'s 'BSD Unix')
  +
***[[OpenBSD]] forked from NetBSD
  +
*[[GNU operating system|GNU]]
  +
*[[μnix]] (concept unix-like operating system for ATMEL microcontrollers)
  +
*[[Linux]] (GNU Free/Open Source Operating System Software combined with the [[Linux kernel]])
  +
{{See also|List of Linux distributions}}
  +
*[[Darwin (operating system)|Darwin]]
  +
*[[OpenSolaris]], contains original Unix (SVR4) code
  +
**[[AuroraUX]], fork of OpenSolaris
  +
*SSS-PC, developed at Tokyo University
  +
*[[Syllable Desktop (operating system)|Syllable Desktop]]
  +
*[[VSTa]]
  +
**[[FMI/OS]], successor of VSTa
  +
  +
====Other Unix-like====
  +
*[[TUNIS]] (University of Toronto)
  +
  +
===Non-Unix-like===
  +
====Research non-Unix-like====
  +
*[[Amoeba distributed operating system|Amoeba]] (research OS by [[Andrew S. Tanenbaum]])
  +
*[[Cambridge CAP computer]] operating system demonstrated the use of security capabilities, both in hardware and software, also a useful fileserver. Written in [[ALGOL 68C]].
  +
*[[Croquet Project|Croquet]]
  +
*[[House (operating system)|House]] Haskell User's Operating System and Environment, research OS written in Haskell and C.
  +
*[[ILIOS]] Research OS designed for routing
  +
*[[Extremely Reliable Operating System|EROS]] microkernel, capability-based
  +
**[[CapROS]] microkernel EROS successor.
  +
**[[Coyotos]] microkernel EROS successor, goal: be first [[Program verification|formally verified]] OS.
  +
*[[L4 microkernel family|L4]] Second generation microkernel
  +
*[[Mach kernel|Mach]] (from OS kernel research at [[Carnegie Mellon University]]; see [[NeXTSTEP]])
  +
*MONADS, capability-based OS designed to support the MONADS hardware projects
  +
**SPEEDOS (Secure Persistent Execution Environment for Distributed Object Systems) builds on MONADS ideas
  +
*[[Nemesis (computing)|Nemesis]] Cambridge University research OS - detailed quality of service abilities.
  +
*[[Spring (operating system)|Spring]] (research OS from Sun Microsystems)
  +
*[[V (operating system)|V]] from Stanford, early 1980s <ref name="capabook">[http://www.cs.washington.edu/homes/levy/capabook/Chapter7.pdf Capability-Based Computer Systems]</ref>
  +
*FreeNOS, a microkernel educational operating system
  +
  +
====[[Free software|Free]]/[[Open source]] non-Unix-like====
  +
*[[Pliant|FullPliant]] (programming language-based)
  +
*[[FreeDOS]] (open source DOS variant)
  +
*[[FreeVMS]] (open source VMS variant)
  +
*[[Haiku (operating system)|Haiku]] (open source inspired by [[BeOS]], under development)
  +
*Kinetic (written in Haskell)
  +
*[[MonaOS]] (written in C++)
  +
*[[ReactOS]] (Windows NT-compatible OS, in early development since 2001)
  +
*osFree (open source OS/2 implementation)
  +
*[[OZONE]] (object-oriented)
  +
*[[MustiOS]] (32-bits operating system)
  +
  +
==Disk Operating Systems==
  +
{{main|DOS}}
  +
*[[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, 2000)
  +
**[[MS-DOS]] (Microsoft's DOS variant for OEM, developed jointly with IBM, versions 1.x - 6. Microsoft's now abandoned DOS variant)
  +
*[[FreeDOS]] ([[open source]] DOS variant)
  +
*[[ProDOS]] (operating system for the [[Apple II]] series computers)
  +
*[[PTS-DOS]] (DOS variant by [[Russia]]n company [[Phystechsoft]])
  +
*RDOS by Leif Ekblad (not to be confused with [[Data General]] Corporation's [[RDOS|"Real-time Disk Operating System"]] for [[Data General Nova]] and [[Data General Eclipse]] minicomputers).
  +
*[[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 Window System|X-windowing]] GUI for DOS)
  +
  +
==Network==
  +
{{main|Network operating system}}
  +
*[[Cambridge Ring]]
  +
*[[CSIRONET]] by ([[Commonwealth Scientific and Industrial Research Organisation|CSIRO]])
  +
*[[CTOS]] ([[Convergent Technologies (Unisys)|Convergent Technologies]], later acquired by [[Unisys]])
  +
*[[Data ONTAP]] by [[NetApp]]
  +
*[[SAN-OS]] by [[Cisco]] (now [[NX-OS]])
  +
*[[Enterprise OS]] by [[Brocade Communications Systems|McDATA]]
  +
*[[ExtremeWare]] by [[Extreme Networks]]
  +
*[[ExtremeXOS]] by [[Extreme Networks]]
  +
*[[Fabric OS]] by [[Brocade Communications Systems|Brocade]]
  +
*[[JUNOS]] (Juniper Networks)
  +
*[[NetWare]] (networking OS by [[Novell]])
  +
*[[Network operating system|NOS]] (developed by [[Control Data Corporation|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).
  +
*[[OliOS]]
  +
*[[Plan 9 from Bell Labs|Plan 9]] (distributed OS developed at [[Bell Labs]], based on Unix design principles but not functionally identical)
  +
**[[Inferno (operating system)|Inferno]] (distributed OS derived from Plan 9, originally from Bell Labs)
  +
**[[Plan B (operating system)|Plan B]] (distributed OS derived from [[Plan 9 from Bell Labs|Plan 9]] and [[Off++ microkernel]])
  +
*[[TurboDOS]] (Software 2000, Inc.)
  +
* [[XPATH OS]] by Brocade
  +
  +
==Web operating systems==
  +
{{main|Web operating system}}
  +
  +
*[[Chrome OS]]
  +
*[[G.ho.st]]
  +
*[[eyeOS]]
  +
*[[DesktopTwo]]
  +
*[[YouOS]]
  +
*[[Browser OS]]
  +
*[[Glide OS 3.0|Glide OS]]
  +
*[[Lucid Desktop]]
  +
  +
==Generic/commodity and other==
  +
*[[BLIS/COBOL]]
  +
*[[Bluebottle OS|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)
  +
*[[FutureOS]] (for Amstrad/Schneider CPC6128 and CPCPlus machines)
  +
*[[Graphical Environment Manager|GEM]] (windowing GUI for CP/M, DOS, and [[Atari]] TOS)
  +
*[[GEOS (8-bit operating system)|GEOS]] (popular windowing GUI for PC, Commodore, Apple computers)
  +
*[[JavaOS]]
  +
*[[JNode]] JNode.org's OS written 99% in Java (native compiled), provides own JVM and JIT compiler. Based on [[GNU Classpath]]
  +
*[[JX (operating system)|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 (operating system)|MERLIN]] for the [[Corvus Concept]]
  +
*[[MorphOS]] (Amiga compatible)
  +
*MSP by [[Fujitsu]] (successor to OS-IV), now MSP/EX<ref>[http://www.fujitsu.com/downloads/GSRVR/msp.pdf Fujitsu Extended System Architecture (EXA) Operating System]</ref>, also known as Extended System Architecture (EXA), for 31-bit mode
  +
*[[nSystem]] by Luis Mateu at DCC, [[Universidad de Chile (university)|Universidad de Chile]]
  +
*[[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 operating system|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 (operating system)|FLEX]] in most respects)
  +
*[[SymbOS]] (GUI based multitasking operating system for [[Z80]] computers)
  +
*[[Symobi]] (GUI based modern micro-kernel OS for [[x86]], [[ARM architecture|ARM]] and [[PowerPC]] processors, developed by Miray Software; used and developed further at [[Technical University of Munich]])
  +
* [http://traos.org/products TraOS, kin to Darwin?] Seems [http://traos.org/news active late 2009]
  +
*[[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 the Univ Calif/San Diego; directed by Prof Ken Bowles; written in Pascal)
  +
*[[UMIX]], made for the [[ICFP Programming Contest]] 2006.
  +
*ScaraOS, a 32 bit mutiboot OS kernel for IA32
  +
*[[Stratus VOS|VOS]] by [[Stratus Technologies]] with strong influence from [[Multics]]
  +
*[[VOS]] by [[Hitachi, Ltd.|Hitachi]] for its IBM-compatible mainframes, based on IBM's [[MVS]]
  +
*[[VM2000]] by [[Siemens AG]]
  +
*[[VisiOn]] (first GUI for early PC machines; not commercially successful)
  +
*[[VPS/VM]] (IBM based, main operating system at [[Boston University]] for over 10 years.)
  +
*[[aceos]] under GPL
  +
*[[Miraculix]] Russian OS, under unknown license.
  +
  +
==For [[Elektronika BK]]==
  +
* [[ANDOS]]
  +
* AO-DOS
  +
* BASIS
  +
* [[CSI-DOS]]
  +
* DOSB10
  +
* DX-DOS
  +
* FA-DOS
  +
* HC-DOS
  +
* KMON
  +
* MicroDOS
  +
* [[MK-DOS]]
  +
* NORD
  +
* NORTON-BK
  +
* RAMON
  +
* PascalDOS
  +
* [[RT-11]]
  +
** ROM embedded
  +
** RT-11SJ
  +
** OS BK-11 (RT-11 version)
  +
* Turbo-DOS
  +
* [[BKUNIX]]
  +
* OS/A WASP
  +
  +
==Hobby==
  +
*[[AROS]] (AROS Research Operating System, formerly known as Amiga Research Operating System)
  +
*[[AtheOS]] (branched to become [[Syllable Desktop]])
  +
**[[Syllable Desktop (operating system)|Syllable Desktop]] (a modern, independently originated OS; see [[AtheOS]])
  +
*DexOS, (Games console OS, for x86, written in [[FASM]])
  +
*[[DSPnano RTOS]] FREE
  +
*[[EROS (microkernel)|EROS]] (Extremely Reliable Operating System)
  +
*FAMOS (Foremost Advanced Memory Operating System)
  +
*[[HelenOS]], based on a preemptible microkernel design
  +
*[[LoseThos]], the stated goal is "programming as entertainment" - oriented toward video games
  +
*[[LSE/OS]]
  +
*[[MenuetOS]] (extremely compact OS with [[GUI]], written entirely in [[FASM]] assembly language)
  +
*[[Möbius]] (an open-source operating system for the IA-32 platform (Intel i386 and compatibles) <ref>http://mobius.sourceforge.net/index.php</ref>)
  +
*MikeOS
  +
*NewOS
  +
*[[Unison RTOS]] FREE
  +
*Visopsys
  +
*TajOS
  +
*eSTORM
  +
  +
==Embedded==<!-- This section is linked from [[Embedded operating system]] -->
  +
===Personal digital assistants (PDAs)===
  +
*[[iPhone OS]] (a subset of [[Mac OS X]])
  +
*[[Inferno (operating system)|Inferno]] (distributed OS originally from [[Bell Labs]])
  +
*[[Palm OS]] from Palm, Inc; now spun off as PalmSource
  +
*[[Symbian OS]]
  +
*[[Windows CE]], from Microsoft
  +
**[[Pocket PC]] from Microsoft, a variant of Windows CE.
  +
**[[Windows Mobile]] from Microsoft, a variant of Windows CE.
  +
*[[Embedded Linux]]
  +
**[[OpenZaurus]]
  +
**[[Ångström distribution]]
  +
**[[Familiar Linux]]
  +
**[[webOS]] from Palm, Inc.
  +
**[[Maemo]] based on [[Debian]] deployed on [[Nokia|Nokia's]] [[Nokia 770]], [[Nokia N800|N800]] and [[Nokia N810|N810]] Internet Tablets.
  +
*[[MS-DOS]] on [[Poqet PC]]
  +
*[[Newton OS]] on [[Apple Newton]] Messagepad
  +
*VT-OS for the Vtech Helio
  +
*[[Magic Cap]]
  +
*[[NetBSD]]
  +
*[[Plan 9 from Bell Labs]]
  +
  +
===Digital media players ===
  +
*[[DSPnano RTOS]]
  +
*[[ipodlinux]]
  +
*[[Pixo|Pixo OS]]
  +
*[[RockBox]]
  +
*[[iPhone OS]] (a subset of [[Mac OS X]])
  +
*[[iriver clix]] OS
  +
  +
===Robots===
  +
* Robotic Operating System
  +
* Dave's Robotic Operating System <ref>[http://dros.org/ Dave's Robotic Operating System]</ref>
  +
  +
===Smartphones===
  +
*[[BlackBerry OS]]
  +
*[[Embedded Linux]]
  +
**[[Access Linux Platform]]
  +
**[[Android (operating system)|Android]]
  +
**[[bada (operating system)|bada]]
  +
**[[Openmoko Linux]]
  +
**[[OPhone]]
  +
**[[Maemo]]
  +
**[[Mobilinux]]
  +
**[[MotoMagx]]
  +
**[[Qt Extended]]
  +
**[[LiMo Platform]]
  +
**[[webOS]]
  +
*[[iPhone OS]] (a subset of [[Mac OS X]])
  +
*[[JavaFX Mobile]]
  +
*[[Palm OS]]
  +
*[[Symbian OS]]
  +
**[[Symbian platform]] (successor to Symbian OS)
  +
*[[Windows Mobile]] (recently changed to 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]]
  +
* CyROS by Cyclades Corporation
  +
* [[DD-WRT]] by NewMedia-NET
  +
* [[Inferno (operating system)|Inferno]] (distributed OS originally from [[Bell Labs]])
  +
* [[IOS-XR]] by [[Cisco Systems]]
  +
* IronWare by [[Foundry Networks]]
  +
* [[JunOS]] by [[Juniper Networks]]
  +
* RouterOS by [[Mikrotik]]
  +
* ROX by Ruggedcom
  +
* ScreenOS by [[Juniper Networks]], originally from Netscreen
  +
* [[Timos]] by [[Alcatel-Lucent]]
  +
* [[Unison Operating System]] by RoweBots
  +
* FTOS by Force10 Networks
  +
* [[RTOS]] by Force10 Networks
  +
  +
===Other embedded===
  +
*[[FreeBSD]]
  +
*[[LOCUS_%28operating_system%29]]<ref>http://www.behance.net/Gallery/Locus-OS/415461</ref>
  +
*[[MINIX]]
  +
*[[.NET Micro Framework]]
  +
*polyBSD (embedded [[NetBSD]])
  +
*ROM-DOS
  +
*[[TinyOS]]
  +
*[[µTasker]]
  +
*[[Windows Embedded]]
  +
**[[Microsoft Windows CE|Windows CE]]
  +
**Windows Embedded Standard
  +
**Windows Embedded Enterprise
  +
**Windows Embedded POSReady
  +
  +
==Capability-based==
  +
===LEGO Mindstorms===
  +
*[[brickOS]]
  +
*[[leJOS]]
  +
*ChyanOS
  +
*SOOS
  +
  +
===Other capability-based===
  +
*[[KeyKOS]] nanokernel
  +
**[[Extremely Reliable Operating System|EROS]] microkernel
  +
***[[CapROS]] EROS successor
  +
***[[Coyotos]] EROS successor, goal: be first [[Program verification|formally verified]] OS
  +
*MONADS, designed to support the MONADS hardware projects.
  +
**SPEEDOS builds on MONADS ideas
  +
*[[V (operating system)|V]] from Stanford, early 1980s <ref name="capabook"/>
  +
  +
==See also==
  +
* [[Comparison of operating systems]]
  +
* [[Timeline of operating systems]]
  +
* [[List of real-time operating systems]]
  +
  +
===Category links===
  +
* [[:Category:Operating systems|Operating systems]]
  +
* [[:Category:Real-time operating systems|Real-time operating systems]]
  +
* [[:Category:Embedded operating systems|Embedded operating systems]]
  +
  +
==References==
  +
{{Reflist|2}}
  +
  +
==External links==
  +
* [http://www.csee.wvu.edu/~jdm/classes/cs258/OScat/ A catalog of operating systems]
  +
* [http://www.google.com/Top/Computers/Programming/Operating_Systems/ Google directory of Operating Systems]
  +
* [http://www.harolds928people.org/index.htm/ Harold Kaplow Remembrances]
  +
  +
 
[[Category:Operating systems|*List of operating systems]]
  
[[Category:Operating systems|*List of operating systems]]
 
[[Category:Lists of software|Operating systems]]
  
[[Category:Lists of software|Operating systems]]
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