List Of Real Operating Systems

* Classic Mac OS
	+ System 1
	+ System 2
	+ System 3
	+ System 4
	+ System 5
	+ System 6
	+ System 7 / Mac OS 7
	+ Mac OS 8
	+ Mac OS 9
* A/UX
* Copland
* MkLinux
* Pink
* Rhapsody
* Mac OS X / OS X / macOS
	+ Mac OS X Public Beta (Kodiak)
	+ Mac OS X 10.1 (Puma)
	+ Mac OS X 10.2 (Jaguar)
	+ Mac OS X 10.3 (Panther)
	+ Mac OS X 10.4 (Tiger)
	+ Mac OS X 10.5 (Leopard)
	+ Mac OS X 10.6 (Snow Leopard)
	+ OS X 10.7 (Lion)
	+ OS X 10.8 (Mountain Lion)
	+ OS X 10.9 (Mavericks)
	+ OS X 10.10 (Yosemite)
	+ OS X 10.11 (El Capitan)
	+ macOS 10.12 (Sierra)
	+ macOS 10.13 (High Sierra)
	+ macOS 10.14 (Mojave)
	+ macOS 10.15 (Catalina)
	+ macOS 11 (Big Sur)
	+ macOS 12 (Monterey)
	+ macOS 13 (Ventura)
	+ macOS 14 (Sonoma)
	+ macOS Server
* Apple Network Server
	+ Apple-Customized IBM AIX
* Apple MessagePad
	+ Newton OS
* iPhone And iPod Touch
	+ iOS / iPhone OS
* iPad
	+ iPadOS
* Apple Watch
	+ watchOS
* Apple TV
	+ tvOS
* Embedded Operating Systems
	+ A/ROSE
	+ bridgeOS
	+ iPod Software (Unnamed Embedded OS For iPod)
	+ Unnamed NetBSD Variant For Airport Extreme And Time Capsule

* Concurrent DOS
	+ Concurrent PC DOS
	+ Concurrent DOS 8-16
	+ Concurrent DOS 286
	+ Concurrent DOS XM
	+ Concurrent DOS 386
		- Concurrent DOS 386/MGE
* Concurrent DOS 68K
* FlexOS
	+ FlexOS 186
	+ FlexOS 286
		- Siemens S5-DOS/MT
		- IBM 4680 OS (Based On FlexOS)
		- IBM 4690 OS (Based On FlexOS)
			* Toshiba 4690 OS (Based On IBM 4690 OS & FlexOS)
	+ FlexOS 386
		- IBM 4690 OS
			* Toshiba 4690 OS
	+ FlexOS 68K
* Multiuser DOS
	+ CCI Multiuser DOS
	+ Datapac Multiuser DOS
		- Datapac System Manager
	+ IMS Multiuser DOS
		- IMS REAL/32
			* IMS REAL/NG
	+ DOS Plus
	+ DR-DOS
		- Novell PalmDOS 1.0
		- Novell "Star Trek"
		- Novell DOS 7
		- Caldera OpenDOS 7.01
		- Caldera DR-DOS 7.02 And Higher

	+ Windows XP (Whistler, Freestyle, Harmony, Symphony, Emerald, Anvil) (Windows NT 5.1)
	+ Windows Server 2003 (Whistler Server) (Windows NT 5.2)
	+ Windows Fundamentals For Legacy PCs (Eiger)
	+ Windows Vista (Longhorn) (Windows NT 6.0)
	+ Windows Azure (Cloud OS Platform)
	+ Windows Home Server (Quattro)
	+ Windows Server 2008 (Longhorn Server)
	+ Windows 7 (Windows NT 6.1)
	+ Windows Server 2008 R2
	+ Windows Home Server 2011 (Vail)
	+ Windows 8 (Windows NT 6.2)
	+ Windows RT
	+ Windows Phone 8
	+ Windows Server 2012
	+ Windows 8.1 (Blue) (Windows NT 6.3)
	+ Windows Phone 8.1
	+ Windows Server 2012 R2
	+ Windows 10 (Windows NT 10.0)
		- Build 1507 (Threshold)
		- Build 1511 (Threshold 2)
		- Build 1607 (Redstone)
		- Build 1703 (Redstone 2)
		- Build 1709 (Redstone 3)
		- Build 1803 (Redstone 4)
		- Build 1809 (Redstone 5)
		- Build 1903 (19H1)
		- Build 1909 (Vanadium)
		- Build 2004 (Vibranium)
		- Build 20H2 (Vibranium)
		- Build 21H1 (Vibranium)
		- Build 21H2 (Vibranium)
		- Build 22H2 (Vibranium)
	+ Windows 10 Mobile
	+ Windows Server 2016
	+ Windows Server 2019
	+ Windows 11 (Windows NT 10.0)
		- Build 21H2 (Sun Valley)
		- Build 22H2 (Sun Valley 2)
	+ Windows Server 2022
* Windows CE
	+ Windows CE 1.0 (Pegasus, Alder)
	+ Windows CE 2.0 (Jupiter, Birch)
	+ Windows CE 2.1
	+ Windows CE 2.11
	+ Windows CE 2.12
	+ Windows CE 3.0 (Cedar, Galileo)
	+ Windows CE 4.0 (Talisker)
	+ Windows CE 4.1 (Jameson)
	+ Windows CE 4.2 (McKendric)
	+ Windows CE 5.0 (Macallan)
	+ Windows Embedded CE 6.0 (Yamakazi)
	+ Windows Embedded Compact 7 (Chelan)
	+ Windows Embedded Compace 2013
	+ KIN OS
* Xbox System Software
	+ Xbox (First Generation) System Software
	+ Xbox 360 System Software
	+ Xbox One System Software
	+ Xbox Series X/S System Software
* Singularity
* Midori
* SONiC (Software For Open Networking In The Cloud)
* Azure Sphere
* CBL-Mariner
* ThreadX

### MCR Corporation

* TMX
* IMOS
* VRX

### Nintendo

* ES
* Wii System Software
* Wii U System Software
* Nintendo Switch System Software

### Novell

* NetWare
* UnixWare
	+ Novell "SuperNOS"
* Novell "Corsair"
	+ Novell "Exposé"
* Open Enterprise Server

### Samsung Electronics

* Bada
* Tizen
* Orsay
* One UI

### SCO

* Xenix
	+ Xenix 286
	+ Xenix 386
* SCO Unix
	+ SCO Open Desktop
* SCO OpenServer 5
* SCO OpenServer 6
* UnixWare
	+ UnixWare 2.x
	+ UnixWare 7

### Sony

* PlayStation 3 System Software
* PlayStation 4 System Software
* PlayStation 5 System Software

### Tandy Corporation

* TRSDOS
* Color BASIC
* NewDos/80
* DeskMate

### TRON Project

* TRON
* T-Kernel

### UNIVAC

* EXEC I
* EXEC II
* EXEC 8 / OS 1100 / 0S 2200
* VS/9

### Wang Laboratories

* WPS
* OIS

### Weston Embedded Solutions

* μC/OS-II
* μC/OS-III
* Cesium RTOS

### Others

* Lisp-Based
	+ Lisp Machines, Inc.
	+ Symbolics General
	+ Texas Instruments
	+ Xerox 1100 Series
* For Electronika BK
	+ ANDOS
	+ CSI-DOS
	+ MK-DOS
* Non-Standard Language-Based
	+ Pilot OS
	+ PERQ
* Other Proprietary Non-Unix-Like
	+ Эльбрус-1 (Elbrus-1)
	+ EOS
	+ EMBOS
	+ GCOS
	+ MAI Basic Four
	+ Michigan Terminal System
	+ MUSIC/SP
	+ OS-ES
	+ PC-MOS/386
	+ Prolog-Dispatcher
	+ SINTRAN III
	+ SkyOS
	+ SODA
	+ THEOS
	+ TSX-32
	+ TX990 / TXDS
* Other Proprietary Unix-Like And POSIX-Compliant
	+ Aegis
	+ Amiga Unix
	+ Coherent
	+ DC/OSx
	+ DG/UX
	+ DNIX
	+ DSPnano RTOS
	+ HeliOS
	+ Interactive Unix
	+ IRIX
	+ MeikOS
	+ NeXTSTEP
	+ OS-9 Unix-Like RTOS
	+ OS9/68K Unix-Like RTOS
	+ OS-9000 Unix-Like RTOS
	+ OSF-1
	+ OPENSTEP
	+ QNX
	+ Rhapsody
	+ RISC iX
	+ RISC/os
	+ RMX
	+ SCO UNIX
	+ SINIX
	+ Solaris
	+ SunOS
	+ SUPER-UX
	+ System V
	+ System V/AT, 386
	+ Trusted Solaris
	+ UniFLEX
	+ Unicos
	+ UTX-32
	+ Zenix

## Non-Proprietary

### Unix / Unix-Like

* MINIX
* BSD
	+ FreeBSD
		- DragonFlyBSD
		- MidnightBSD
		- GhostBSD
		- TrueOS
		- NomadBSD
	+ NetBSD
		- OpenBSD
			* Bitrig
			* Fugulta
	+ Darwin
* GNU
* Linux
	+ Android
		- Android-x86
			* Remix OS
	+ EulerOS
* Redox
* OpenSolaris
	+ Illumos
		- OpenIndiana
		- Nexenta OS
		- SmartOS
* RTEMS
* Syllable Desktop
* VSTa
* Plurix
* TUNIS
* Xv6
* SerenityOS
* LiteOS
	+ OpenHarmony

### Non-Unix

* Cosmos
* EmuTOS
* FreeDOS
* Genode
* Ghost OS
* Haiku
* ITS (Incompatible Timesharing System)
* MagiC
* osFree
* OSv
* Phantom OS
* ReactOS
* SharpOS
* TempleOS
* Visopsys

## Research

### Unix / Unix-Like

* Plan 9 From Bell Labs
	+ Inferno
	+ 9front
* Research Unix

### Non-Unix

* Amoeba
* Barrelfish
* Croquet
* EROS
	+ CapROS
* Harmony
* HelenOS
* House
* ILIOS
* L4
* Mach
* Nemesis
* Singularity
* Spring
* THE Multiprogramming System
* Thoth
* V
* Verve
* Xinu

## Disk Operating Systems (DOS)

* 86-DOS
	+ PC DOS
	+ MS-DOS
* Concurrent CP/M-86 3.1
	+ Concurrent DOS 3.1-4.1
		- Concurrent PC DOS 3.2
			* DOS Plus 1.1, 1.2, 2.1
		- Concurrent DOS 8-16
		- Concurrent DOS 286 1.x
			* FlexOS 1.00-2.34
				+ FlexOS 186
				+ FlexOS 286
					- Siemens S5-DOS/MT
					- IBM 4680 OS
					- IBM 4690 OS
						* Toshiba 4690 OS
				+ FlexOS 386
					- IBM 4690 OS
						* Toshiba 4690 OS
		- Concurrent DOS 386 1.0, 1.1, 2.0, 3.0
			* Concurrent DOS 386/MGE
			* Multiuser DOS 5.0, 5.01, 5.1
				+ CCI Multiuser DOS 5.0-7.22
				+ Datapac Multiuser DOS
					- Datapac System Manager 7
				+ IMS Multiuser DOS 5.1, 7.0, 7.1
					- IMS REAL/32 7.50, 7.51, 7.52, 7.53, 7.54, 7.60, 7.61, 7.62, 7.63, 7.70, 7.71, 7.72, 7.73, 7.74, 7.80, 7.81, 7.82, 7.83, 7.90, 7.91, 7.92, 7.93, 7.94, 7.95
						* IMS REAL/NG
		- Concurrent DOS XM 5.0, 5.2, 6.0, 6.2
			* DR DOS 3.31, 3.32, 3.33, 3.34, 3.35, 5.0, 6.0
				+ Novell PalmDOS 1
				+ Novell DR DOS "StarTrek"
				+ Novell DOS 7
					- Novell DOS 7 Updates 1-10
						* Caldera OpenDOS 7.01
							+ Enhanced DR-DOS 7.01.0x
								- Dell Real Mode Kernel
					- Novell DOS 7 Updates 11-15.2
						* Caldera DR-DOS 7.02-7.03
							+ DR-DOS "WinBolt"
							+ OEM DR-DOS 7.04-7.05
							+ OEM DR-DOS 7.06 (PQDOS)
							+ OEM DR-DOS 7.07
* FreeDOS
* ProDOS
* PTS-DOS
* TurboDOS
* Multi-Tasking User Interfaces And Environments For DOS
	+ DESQView + QEMM 386
	+ DESQView/X

## Network Operating Systems

* Banyan VINES
* Cambridge Ring
* Cisco IOS
* Cisco NX-OS
* CTOS
* Data ONTAP
* ExtremeWare
* ExtremeXOS
* Fabric OS
* JunOS
* NetWare
* Network operating system (NOS)
* Novell Open Enterprise Server
* Plan 9
	+ Inferno
* SONiC
* TurboDOS

## Generic, Commodity And Others

* BLIS/COBOL
* A2
* BS1000
* BS2000
* BS3000
* Contiki
* FLEX9
* Graphics Environment Manager
* GEOS
* JavaOS
* JNode
* JX Java
* KERNAL
* MERLIN
* MorphOS
* MSP
* NetWare
* Oberon
* OSD/XC
* OS-IV by Fujitsu
* Pick
* PRIMOS
* Sinclair QDOS
* SSB-DOS
* SymbOS
* Symobi
* TripOS
* TurboDOS
* UCSD P-System
* VOS
* VOS3
* VM2000
* Visi On
* VPS/VM

## Hobbyist Operating Systems

* AROS
* AtheOS
	+ Syllable Desktop
* BareMetal
* DSPnano RTOS
* EmuTOS
* EROS
* HelenOS
* LSE/OS
* MenuetOS
	+ KolibriOS
* MMURTL
* SerenityOS
* SerpaeOS
* ToaruOS
	+ PonyOS

## Embedded Operating Systems

* Mobile Operating Systems
	+ DIP DOS
	+ Embedded Linux
		- Android
			* CalyxOS
			* DivestOS
			* EMUI
			* Flyme OS
			* GrapheneOS
			* LineageOS
			* MIUI
			* Replicant
		- Firefox OS
			* KaiOS
		- Ångström distribution
		- Familiar Linux
		- Mæmo
		- OpenZaurus
		- webOS
		- Access Linux Platform
		- Bada
		- Openmoko Linux
		- OPhone
		- MeeGo
		- Mobilinux
		- MotoMagx
		- Qt Extended
		- Sailfish OS
		- Tizen
		- Ubuntu Touch
		- PostmarketOS
	+ Inferno
	+ Magic Cap
	+ MS-DOS
	+ NetBSD
	+ Newton OS
	+ Palm OS
	+ PEN/GEOS
	+ PenPoint OS
	+ Plan 9 From Bell Labs
	+ PVOS
	+ Symbian OS
		- EPOC
	+ Windows CE
		- Pocket PC
		- Windows Mobile
		- Windows Phone
	+ DSPnano RTOS
	+ iOS
		- watchOS
		- tvOS
	+ iPod Software
	+ iPodLinux
	+ iRiver Clix OS
	+ RockBox
	+ BlackBerry OS
	+ PEN/GEOS, GEOS-SC, GEOS-SE
	+ Palm OS
	+ Symbian Platform
	+ BlackBerry 10
	+ HarmonyOS
* Routers
	+ CatOS
	+ Cisco IOS
	+ DNOS – by DriveNets
	+ Inferno
	+ IOS-XR
	+ JunOS
	+ LCOS
	+ Linux
		- OpenWrt
			* DD-WRT
			* LEDE
			* Gargoyle
			* LibreCMC
		- Zeroshell
	+ FTOS – by Force10 Networks
	+ FreeBSD
		- m0n0wall
		- OPNsense
		- pfsense
* Other Embeddeds
	+ Apache Mynewt
	+ ChibiOS/RT
	+ Contiki
	+ ERIKA Enterprise
	+ eCos
	+ NetBSD
	+ Nucleus RTOS
	+ NuttX
	+ Minix
	+ NCOS
	+ freeRTOS, openRTOS, safeRTOS
	+ Fuchsia
	+ OpenEmbedded / Yocto Project
	+ OpenHarmony
	+ pSOS
	+ QNX
	+ REX OS
	+ RIOT
	+ ROM-DOS
	+ TinyOS
	+ ThreadX
	+ RT-Thread
	+ DSPnano RTOS
	+ Windows IoT
		- Windows CE
		- Windows IoT Core
		- Windows IoT Enterprise
	+ Wind River VxWorks RTOS
	+ Wombat
	+ Zephyr
* LEGO Mindstorms
	+ brickOS
	+ leJOS

## Capability-Based

* Cambridge CAP Computer
* Flex Machine
* HYDRA
* KeyKOS
	+ EROS
		- CapROS
* V