Samstag, 12. Januar 2019

Operating Systems: An (Almost) Complete Timeline and Family Tree

In this post you'll find a family tree and timeline of operating systems. I have tried to include all operating systems, no matter how old or obscure. Of course, a complete list is virtually impossible, as there is no way to catalogue all the tiny hobby and embedded systems that may exist somewhere.

Please also note that I only included a few selected Linux/BSD/Solaris distributions (it is arguable whether these should count as an OS on their own or not).

Currently, the family tree includes between 800 and 900 different operating systems.

Download as PNG 
Download as PNG - Mirror (GDrive)
Download as PNG - Mirror 2 (Imgur)
(external link, 4 MB)
Download as SVG (external link)



If anyone would like to make corrections, please feel tell me. The source files are here. I used Gnuclad to compile the timeline.

The operating system in this picture include:
(only original/first names, later renamings are shown in the graph but not in the list)

  • Unix
    • 3BSD
    • 4.4BSD
    • A/UX [Apple]
    • AIX [IBM]
    • Amiga Unix [Amiga]
    • AOS [IBM]
    • Atari Unix [Atari]
    • audioOS [Apple]
    • BKUNIX
    • BRL Unix
    • BSD
    • BSD Net/1 [Acorn]
    • BSD Net/2
    • BSD/OS
    • CB UNIX
    • CellOS [Sony Playstation 3]
    • Concentrix [Alliant]
    • ConvexOS [Convex]
    • COSIX [CS&S]
    • CTIX [Convergent]
    • CXOs [Cray]
    • Darwin [Apple]
    • DC/OSx [Pyramid]
    • DEC OSF/1 [DEC]
    • Dell Unix [Dell]
    • DG/UX [Data General]
    • DragonFlyBSD
    • Dynix [Sequent Computer Systems]
    • Eurix/Generics Unix [Generics]
    • FreeBSD
    • Genix [National Semiconductor]
    • GhostBSD
    • GNU/Hurd
    • HeliOS [Perihelion]
    • HEP-UPX [Denelcor]
    • Hitachi OSF/1-MJ [Hitachi]
    • HI-UX [Hitachi]
    • HP OSF/1 [HP]
    • HPBSD [HP]
    • HP-UX [HP]
    • Idris [Whitesmiths]
    • Illumos
    • iOS [Apple]
    • IRIS GL2 [SGI]
    • IRIX [SGI]
    • IS/1 [Interactive]
    • JunOS [Juniper]
    • Lites
    • LSX
    • Mac OS X Server 10 [Apple]
    • Mach (kernel)
    • Mach386 [mt Xinu]
    • MachTen [Tenon]
    • MacMach
    • macOS X [Apple]
    • MAXION/OS [Concurrent]
    • MERT
    • Micronix [Morrow]
    • Microport Unix
    • MidnightBSD
    • Mini Unix
    • MkLinux
    • Monterey
    • more/BSD [mt Xinu]
    • MP-RAS Unix [NCR]
    • Munix [Generics]
    • NDIX [Norsk Data]
    • NetBSD
    • News-OS [Sony]
    • NeXTSTEP [NeXT Computer]
    • NonStop-UX [HP]
    • OpenBSD
    • OpenDarwin
    • OpenIndiana
    • OpenSolaris
    • OS/MP [Solbourne]
    • OSF/1
    • OSF/1 AD [Locus Computing]
    • Paragon OSF/1 [Paragon]
    • PC-BSD [iXsystems]
    • PC-IX [Interactive Systems Corp]
    • PWB/Unix
    • Real Time UNIX [Concurrent]
    • RetroBSD
    • Rhapsody
    • RISC Unix [Acorn]
    • RISC/OS [MIPS]
    • RT PC AOS [IBM]
    • Sinix [Siemens]
    • SmartOS
    • Solaris [Sun]
    • SPIX [Bull Computers]
    • SPP-UX [Convex]
    • SunOS [Sun]
    • SUPER-UX [NEC]
    • TI System V [Texas Instruments]
    • TNIX [Tektronix]
    • Trusted IRIX/B [SGI]
    • Trusted Solaris [Sun]
    • Trusted Xenix [SCO]
    • TS
    • tvOS [Apple]
    • UCLA Locus
    • UCLA Secure Unix
    • Ultrix 32M [DEC]
    • UMAX 4.3 [Encore]
    • Unicos MAX [Cray]
    • Unicos/mk [Cray]
    • Unicos/mp [Cray]
    • UNICS [AT&T/Bell Labs]
    • UniPlus System V [UniSoft]
    • UNIX 32V
    • UNIX System III [AT&T]
    • Unix/NS [NCR]
    • UNSW
    • USG
    • UTEK [Tektronix]
    • UTS [Amdahl]
    • UTS/M [Fujitsu]
    • UTX/32(S) [Gould]
    • UXP/DS [Fujitsu]
    • V/386
    • V7M [DEC]
    • Venix [VenturCom]
    • watchOS [Apple]
    • WEGA [East Germany]
    • Xenix [Microsoft]
    • xMach
  • Unixoid but not genetic Unix
    • 9atom
    • 9front
    • ABCenix [Luxor]
    • AFROS (based on EmuTOS)
    • ANALIX
    • BlackBerry 10 [BlackBerry]
    • Blackberry PlayBook OS [RIM]
    • C Executive [JMI Software]
    • Chorus [Chorus Systemes]
    • Coherent [MWC]
    • Cromix [Cromemco]
    • Data ONTAP [NetApp]
    • DCC-IX
    • Digix [Digirede]
    • DNIX [Dataindustrier]
    • Domain/OS [Apollo]
    • DRM System [NV Philips]
    • EDIX
    • GNO/ME [Procyon]
    • Harvey OS
    • Inferno
    • IOS-XR [Cisco]
    • LUnix
    • LynxOS
    • MeikOS [Meiko Scientific]
    • MERLIN [Silicon Valley Software]
    • MINIX
    • Minix-VMD
    • MiNT/MultiTOS
    • MSS
    • Mulplix
    • Multics
    • NachOS
    • Oasis [Phase One Systems]
    • OS 9 [Microware]
    • OSv [Clodius Systems]
    • Pintos
    • Plan 9 [AT&T/Bell Labs]
    • Plurix
    • Punix
    • QNX Neutrino [QNX Software]
    • QUNIX [QNX Software]
    • REAL
    • Redox OS
    • SIDIX
    • Sortix
    • SOX [Cobra Tecnologia]
    • Sprite
    • System/88 OS [IBM]
    • TC/IX [Control Data]
    • Thix
    • Thoroughbred/OS [Omega]
    • TUNIS
    • UNOS [Charles River Data Systems]
    • USIX [System Six]
    • UZIX
    • VirtualLogix C5 [Jaluna]
    • VMEexec [Motorola]
    • VOS [Stratus Technologies]
    • VSTa
    • XDI [Crescendo Communications]
    • Xinu
    • Unixoid system based on DOS-like systems
      • INOS [Introl]
      • PCUNIX/PCNX [Wendin]
      • UniFLEX [TSC]
    • Linux
      • Android [Google]
      • Arch Linux
      • Bada [Samsung]
      • CentOS
      • ChromeOS [Google]
      • CyanogenMod
      • Debian GNU/Linux
      • Enoch Linux
      • Fedora Core
      • Firefox OS [Mozilla]
      • KaiOS [KaiOS Technologies]
      • KDE Neon
      • Linux Mint
      • Mageia Linux
      • Mandrake Linux [MandrakeSoft]
      • MeeGo
      • mer
      • My Home Screen [Panasonic]
      • OS2005 [Nokia]
      • Palm webOS [Palm]
      • PCLinuxOS
      • Red Hat Linux [Red Hat]
      • Sailfish OS [Jolla]
      • Slackware Linux
      • SuSE Linux [SuSE]
      • SUSE Linux Enterprise [SuSE]
      • Tizen [Samsung]
      • Ubuntu [Canonical]
      • Ubuntu Touch [Canonical]
  • Non-Unix systems that were superseded by a unixoid version with the same name
    • BlackBerry OS [RIM]
    • System [Apple]
  • CP/M-like
    • 4860 OS [IBM]
    • Apple CP/M [Apple]
    • BCU880 [Robotron]
    • CCI Multiuser DOS [Concurrent Controls]
    • Compaq DOS [Compaq]
    • Concurrent CP/M-68k [Digital Research]
    • Concurrent CPM-80 [Digital Research]
    • COS-PSA [Robotron]
    • CP/A [Robotron]
    • CP/K [Robotron]
    • CP/KC [Robotron]
    • CP/L [Robotron]
    • CP/M [Digital Research]
    • CP/M 80 [Digital Research]
    • CP/Z [Robotron]
    • CPM-FDE [Robotron]
    • CSOC [Robotron]
    • CSOS [Robotron]
    • DAC [Robotron]
    • DataPac Multiuser DOS [DataPac]
    • DCP [Robotron]
    • DIP DOS [Atari]
    • doesmu
    • DOS Plus [Digital Research]
    • DOS-PSA [Robotron]
    • DR PalmDOS [Digital Research]
    • DR-DOS/OpenDOS [Digital Research]
    • FlexOS [Digital Research]
    • IMS Multiuser DOS
    • K8918-OS [Robotron]
    • MFA-CPA [Robotron]
    • MicroDOS [Robotron]
    • MicroOS
    • MP/M-80 [Digital Research]
    • MP/M-86 [Digital Research]
    • MS-DOS [Microsoft]
    • MSX-DOS [Microsoft]
    • OS/M [Robotron]
    • PD-DOS
    • QDOS/86-DOS [SCP]
    • S5-DOS/MT [Siemens]
    • SCP [Robotron]
    • SCP/M [Robotron]
    • SCP-IBE [Robotron]
    • TOS/M [Robotron]
    • Towns OS [Fujitsu]
    • Wendin-DOS [Wendin]
    • XDOS
    • Z-DOS [Microsoft]
  • Other DOS systems
    • Altair DOS [MITS]
    • AMSDOS [Amstrad]
    • ANDOS
    • AOS [Data General]
    • AOS/RT32 [Data General]
    • AOS/VS [Data General]
    • AOS/VS II [Data General]
    • Apple DOS [Apple]
    • Apple SOS [Apple]
    • Atari DOS [Atari]
    • Batch-11/DOS-11 [DEC]
    • BonnyDOS/286
    • CDOS [Cromemco]
    • CMB DOS [Commodore]
    • CSI-DOS
    • DG SOS [Data General]
    • DOS XL [Optimized Systems]
    • Embedded DOS [General Software]
    • GDOS [Miles Gordon Technology]
    • GS/OS [Apple]
    • HDOS [Heath Company]
    • ICOS
    • IS-DOS
    • MDOS/MIDAS [Microsoft]
    • MiniDOS
    • MK-DOS
    • MP/AOS [Data General]
    • MP/OS [Data General]
    • NewDOS/80 [Apparat]
    • Oric DOS [Tangerine]
    • Paragon DOS [Paragon]
    • PC-MOS/386 [Software Link]
    • ProDOS [Apple]
    • PTS-DOS [PhysTechSoft]
    • ROM-DOS [Datalight]
    • RxDOS
    • Sinclair QDOS
    • SMSQ/E
    • SpartaDOS X [ICD Inc]
    • SSB-DOS (Smoke Signal DOS) [TSC]
    • SuperDOS
    • TASiS
    • TR-DOS [Technology Research]
    • TRSDOS [Tandy]
    • TurboDOS [Software 2000]
  • RSX-11 or VMS-like
    • ArcaOS
    • DOS/RV (OCPBM) [Soviet Union]
    • eComStation [Serenity Systems]
    • FreeVMS
    • IAS [DEC]
    • Micro/RSX [DEC]
    • MicroVMS [DEC]
    • MOOS [Robotron]
    • OMOS [Robotron]
    • OS/2 [IBM/Microsoft]
    • OS/RW [Soviet Union]
    • osFree
    • PCVMS [Wendin]
    • ReactOS
    • RSX-11M [DEC]
    • RSX-11M+ [DEC]
    • RSX-11S [DEC]
    • RSX-15 [DEC]
    • RSX180
    • RSX-20F [DEC]
    • SM-EVM [Soviet Union]
    • VAX-11/VMS [DEC]
    • VAXELN [DEC]
    • Windows 10 Mobile [Microsoft]
    • Windows NT 3.x [Microsoft] and successor (up to Windows 10 today)
    • Windows Phone 8 [Microsoft]
    • Windows RT [Microsoft]
  • Other Microsoft systems
    • Midori
    • Pocket PC and Windows Mobile
    • Singularity
    • Windows CE
    • Windows Phone 7
  • AmigaOS-like
    • AROS
    • AspireOS
    • AtheOS
    • CDTV
    • BeOS [Be Inc]
    • MorphOS
    • NewOS
    • OpenBeOS
    • PhOS/PhosphurOS
    • pOS [ProDAD]
    • TripOS [Commodore]
    • VMWAros
  • RISC OS-like
    • Arthur [Acorn]
    • NCOS [Element 15]
    • RISC OS
  • Systems for IBM mainframes, by IBM
    • BOS/360 [IBM]
    • BSEPP (VM/BSE) [IBM]
    • CP/CMS [IBM]
    • CP-50/CP-67 [IBM]
    • CPF [IBM]
    • CTSS [IBM]
    • Fortran Monitor System (FMS) [IBM]
    • IBM 1410/7010 OS [IBM]
    • IBSYS [IBM]
    • IM/370 [IBM]
    • OS/400 [IBM]
    • OS/MVT [IBM]
    • OS/PCP [IBM]
    • SABER [IBM]
    • SABRE [IBM]
    • SEPP (VM/SE) [IBM]
    • SRTOS [IBM]
    • SSP [IBM]
    • TOS/360 [IBM]
    • TSS/360 [IBM]
    • VM/CMS [IBM]
    • VM/IS
    • VM/IX [Interactive/IBM]
    • VP/CSS [IBM]
  • Systems for IBM mainframes, not by IBM
    • BOS [Fujitsu]
    • BS3000 [Siemens]
    • DOS/ES [Robotron]
    • Edos [TSCS]
    • OS ES [Soviet Union]
    • OSIV/ESPIII [Fujitsu]
    • OSIV/F2 [Fujitsu]
    • OSIV/F4 [Fujitsu]
    • OSIV/X8 [Fujitsu]
    • OSIV/XSP [Fujitsu]
    • VOS2 [Hitachi]
  • L4 microkernel family
    • CodeZero
    • E1 Distributed OS
    • Fiasco
    • Fiasco.OC/L4Re
    • Gnuppix GNU/Hurd-L4
    • Iguana/Wombat OS
    • L2/Eumel
    • L4/Alpha
    • L4/MIPS
    • L4Ka::Pistachio (X.2)
    • NICTA::L4-embedded
    • NOVA
    • OKL4
    • Osker
    • P4
    • REX OS
    • seL4
    • TUD:OS
    • WrmOS
  • OSEK-compliant systems
    • ERIKA Enterprise
    • ERCOS [ETAS]
    • osCAN [Vector Informatik]
    • MICROSAR OS [Vector Informatik]
    • ProOSEK [3SOFT/Elektrobit]
    • ProOSEK/time [3SOFT Elektrobit]
    • RTA-OSEK [ETAS]
    • RTA-OS [ETAS]
    • tresos [3SOFT/Elektrobit]
    • TTP-OS [TTTech]
    • Arctic Core
    • FreeOSEK
    • nxtOSEK
    • ev3OSEK
    • openOSEK
    • TOPPERS-OSEK
    • Trampoline
    • OSEKturbo [Metrowerks]
    • Trioz OSEK RTOS [Trioztech]
    • PICOS18 [Pragmatic]
    • mKernel
  • Other systems and small families that don't fit in any of the other categories
    • (Open)Genera [Genera]
    • 3DS system software [Nintendo]
    • A/ROSE [Apple]
    • Accent (kernel)
    • Admiral
    • AL/1
    • Aleph (kernel)
    • AlliedWare [Allies Telesis]
    • AMBOSS [Siemens]
    • AMIGOD
    • Amoeba
    • AMOS [Alpha Microsystems]
    • AMOS 32 [Alpha Microsystems]
    • AMOS/L [Alpha Microsystems]
    • AN/FSQ-32
    • AOS [Burroughs]
    • Apache Mynewt
    • Apple II Pascal [Apple]
    • ARX [Acorn]
    • Atari TOS [Atari]
    • Atlas I Supervisor
    • AuraOS
    • AVM/EF [Fujitsu]
    • B1/B2/B3/B4 [NCR]
    • Baget RTOS (OS2000)
    • Banyan VINES [Banyan Systems]
    • BareMetal [Return Infinity]
    • Barrelfish [Microsoft]
    • Basic Executive System
    • Berkeley Timesharing System
    • BESYS [Bell Labs/AT&T]
    • BKY
    • BLIS/COBOL [Information Processing Inc]
    • Bluebottle
    • BOS1810 [Robotron]
    • brickOS
    • BROS [Robotron]
    • BS2000 [Siemens]
    • BS600 [Robotron]
    • BS-M [Siemens]
    • CAL
    • Cambridge CAP OS
    • Cambridge Ring
    • CapROS
    • CAPS-11 [DEC]
    • CAPS-8 [DEC]
    • CCOS [Corvus Systems]
    • ChibiOS/RT
    • Chios
    • Chippewa Operating System [Cray]
    • clix OS [iriver]
    • CNK OS [IBM]
    • Color BASIC [Microsoft]
    • CombOS [Trueb AG/Winter AG]
    • Contiki
    • Copland [Apple]
    • COQOS [OpenSynergy]
    • COS-310/350 [DEC]
    • Cosmos
    • Coyotos
    • CP-6 [Honeywell]
    • CPC-OS [Amstrad]
    • CPS (IBM Series/1) [IBM]
    • Cray Operating System [Cray]
    • Croquet
    • CSIRONET
    • CTOS [Convergent Technologies]
    • Dartmouth Time Sharing System (DTSS)
    • David [Microware]
    • DECtape Library System [DEC]
    • Deos [DDC-I]
    • DexOS
    • DIPOS [Nixdorf]
    • DiscOS
    • DMS (IBM 1130) [IBM]
    • DMS (IBM Series/3) [IBM]
    • DNOS [Dell]
    • DNOS [Texas Instruments]
    • DPCX (IBM 8100) [IBM]
    • DPPX (IBM 8100) [IBM]
    • Dragon Slayer
    • DRYOS [Canon]
    • DSi system software [Nintendo]
    • DSPnano RTOS [RowerBots]
    • DX10 [Texas Instruments]
    • DYSEAC
    • eCos
    • EDX (IBM Series/1) [IBM]
    • EIEX [Robotron]
    • Elbrus-1
    • EMAS
    • embOS [Segger]
    • EmuTOS
    • Enterprise OS [McDATA]
    • EOS [ETA Systems]
    • es [Nintendo]
    • ETOS
    • EUROS RTOS [EUROS]
    • EXEC [Unisys]
    • Exec 8 [Unisys]
    • Executive [ICL]
    • ExtremeWare [Extreme Networks]
    • Fabric OS [Brocade]
    • Fontac Monitor [Fujitsu]
    • FreeRTOS
    • Fuchsia [Google]
    • Future OS
    • Galileo [Acorn]
    • GAMMA-11 [DEC]
    • GECOS/GCOS [General Electric]
    • GeekOS
    • Genode
    • GEORGE [ICL]
    • GEOS [Berkeley Softworks]
    • Ghost OS
    • GMOS [General Motors]
    • Gnosis
    • HeartOS [DDC-I]
    • HelenOS
    • HEP/OS [Denelcor]
    • House
    • HP-1000/RTE [HP]
    • HT-11 [Heathkit]
    • Hurricane
    • HYDRA
    • IDA
    • IJMON [IBM]
    • ILIOS
    • IMOS [NCR]
    • INTEGRITY [Green Hills Software]
    • INTEGRITY-178B [Green Hills Software]
    • IOS [Cisco]
    • IronWare [Foundry Networks]
    • IS/M [Robotron]
    • ISIS [Intel]
    • ITOS [CTM Computer]
    • ITS
    • J Operating System/LoseThos
    • J/MultiJob [ICL]
    • JAMB [Robotron]
    • JavaOS [Sun Microsystems]
    • JNode
    • JX
    • K42 [IBM]
    • KDF9 Timesharing Director [English Electric]
    • KERNAL [Commodore]
    • KI-TELNEX
    • Kitten [Sandia]
    • KMON
    • KOBRA [Robotron]
    • KolibriOS
    • KRONOS [Control Data]
    • LAP6-DIAL
    • LCOS [Lancom Systems]
    • leJOS
    • LEO I OS [J. Lyons and Co.]
    • Lisa OS [Apple]
    • LOS 
    • LSE/OS
    • MACE [Control Data]
    • Machine Operating System (MOS) [Acorn]
    • Magic Cap [General Magic]
    • MAI Basic Four
    • MaRTE OS
    • MARTOS [AEG]
    • MARTOS-K [AEG]
    • MCP [Burroughs]
    • MDOS [Micropolis]
    • MenuetOS
    • MEOS [Robotron]
    • Michigan Terminal System (MTS)
    • Micro/RSTS [DEC]
    • MicroC/OS [Micrium]
    • MicroMore [Access]
    • MicroMPX [Encore]
    • micro-velOSity [Green Hills Software]
    • MikeOS
    • MonaOS
    • MPE-A [HP]
    • MPX (IBM 1800) [IBM]
    • MPX-32 [Systems Engineering Labs]
    • MS/8 [DEC]]
    • MULTI-8 [DEC]
    • MULTOS [DEC]
    • MultOS/8 [DEC]
    • MUMPS 
    • MUSIC/SP
    • MZOS [Micropolis]
    • Nanos
    • Nemesis
    • Netware [Novell]
    • Newton OS [Apple]
    • NLTSS
    • NonStop [Tandem]
    • NOS [Control Data]
    • Nucleus RTOS [Accelerated]
    • Nut/OS
    • Oberon
    • On Time RTOS-32 [On Time Informatik]
    • OpenCatamount [Sandia]
    • OpenComRTOS/Virtuoso Next [Altreonic]
    • OpenRTOS [Wittenstein]
    • ORVYL
    • OS/78 [DEC]
    • OS-9 RTOS [Microware]
    • OS-9000 [Microware]
    • OSC245 [Ferranti]
    • OSD/BC [Fujitsu]
    • OSD/XC [Fujitsu]
    • OSE & OS80 [ENEA AB]
    • Palm OS [Palm]
    • PANOS [Acorn]
    • PAPL [Robotron]
    • PBS (Plattenbetriebssystem) [Siemens]
    • PC-BLIS
    • PDP-1 OS [DEC]
    • PDP-6 Monitor [DEC]
    • PEARL Operating System (POS) [Brown, Boverie & Cie]
    • PenPoint OS [GO Corp]
    • PERQ [Three Rivers]
    • Phantom OS
    • Pick
    • PilOS
    • PlayStation Portable system software [Sony]
    • PlayStation Vita system software [Sony]
    • PRIMOS [Prime]
    • PS/8 [DEC]
    • pSOS [Software Components Group]
    • p-System
    • RACS
    • Rainbow
    • RBASIC [Robotron]
    • RC 4000 MS [Regnecentralen]
    • RIOT
    • RMOS [Siemens]
    • RMX/iRMX [Intel]
    • RockBox
    • RPS (IBM Series/1) [IBM]
    • RSTS-11 [DEC]
    • RT-11 [DEC]
    • RTEMS
    • RTMOS [General Electric]
    • RTOS-UH
    • RTXC Quadros
    • SafeRTOS [Wittenstein]
    • SAGE [IBM]
    • SCIOPTA RTOS
    • SCOMP [BAE Systems]
    • SCOPE [Control Data]
    • ScreenOS [Juniper]
    • SECOS
    • SEPIA [Kolter Electronic]
    • SeriX (IBM Series/1) [IBM]
    • SHARE Operating System (SOS)
    • Share/43 [Remington]
    • Share/7 [Remington]
    • SharpOS
    • SIBO OS [Psion]
    • Simultaneous Operating System (SIOS) [Control Data]
    • SINTRAN I [Norsk Data]
    • SIOS [Robotron]
    • SIPROS [Control Data]
    • SkyOS
    • S-OS
    • Spring [Sun Microsystems]
    • SPSYS
    • SRT8 [DEC]
    • STSS
    • SUNMOS [Sandia]
    • Switch system software [Nintendo]
    • SymbOS
    • Symobi [Miray Software]
    • SYSMIC [R2E]
    • SYS-PSA [Robotron]
    • Taligent [Apple]
    • Tape Director (WHIRLWIND I)
    • TCOS [T-Systems]
    • TDOS
    • TENEX [DEC]
    • THE multiprogramming system 
    • Thoth
    • ThreadX [Express Logic]
    • TiMOS [Alcatel-Lucent]
    • TinyOS
    • TI-RTOS [Texas Instruments]
    • Titan Supervisor
    • T-Kernel
    • TME [ICL]
    • TMX [NCR]
    • ToaruOS
    • Topaz/Taos
    • TOPS-20 [DEC]
    • TOPSY
    • Tornado
    • TriangleOS
    • TRON
    • TSOS [RCA]
    • TSS-8 [DEC]
    • TSX (IBM 1800) [IBM]
    • TSX-32 [S&H Computer Systems]
    • TX990/TXDS [Texas Instruments]
    • UDOS [Robotron]
    • UMES (University of Michigan Executive System)
    • Unison RTOS [RoweBots]
    • Urbit
    • V
    • Verex
    • VersaDOS
    • Viewpoint/GlobalView [Xerox]
    • Virtuoso RTOS
    • Visopsys
    • VM2000 [Siemens]
    • VME/B [ICL]
    • VME/K [ICL]
    • VRTX [Wind River Systems]
    • VRX [NCR]
    • VSOS [Wang]
    • VxWorks AE [Wind River Systems]
    • WAITS
    • Wii system software [Nintendo]
    • Wii U system software [Nintendo]
    • WMCS [WICAT]
    • WPS [Wang]
    • Xerox Alto OS [Xerox]
    • Zephyr [Wind River Systems]

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