https://eylenburg.github.io/os_familytree.htm

Maps and Tables

by Alphonse Eylenburg
eylenburg.github.io

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Operating Systems: Timeline and Family Tree

Includes over 830 operating systems so far

Last updated: June 2021
To do: explain colours in picture, add a conclusion

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. Tip: use Ctrl+F (Cmd+F on Mac) to search for a
system.

 

Click here to open the picture in a new tab

If anyone would like to make corrections, please feel tell me.

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
      + Unleashed
      + 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
      + Escape
      + 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]
      + Onyx
      + 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
      + SeaOS
      + SerenityOS
      + 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
          o INOS [Introl]
          o PCUNIX/PCNX [Wendin]
          o UniFLEX [TSC]
      + Linux
          o 
          o Android [Google]
          o Arch Linux
          o Bada [Samsung]
          o CentOS
          o ChromeOS [Google]
          o CyanogenMod
          o Debian GNU/Linux
          o Enoch Linux
          o Fedora Core
          o Firefox OS [Mozilla]
          o KaiOS [KaiOS Technologies]
          o KDE Neon
          o Linux Mint
          o Mageia Linux
          o Mandrake Linux [MandrakeSoft]
          o MeeGo
          o mer
          o My Home Screen [Panasonic]
          o OS2005 [Nokia]
          o Palm webOS [Palm]
          o PCLinuxOS
          o Red Hat Linux [Red Hat]
          o Sailfish OS [Jolla]
          o Slackware Linux
          o SuSE Linux [SuSE]
          o SUSE Linux Enterprise [SuSE]
          o Tizen [Samsung]
          o Ubuntu [Canonical]
          o 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]
      + ChrysaLisp
      + 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]
      + DawnOS
      + 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
      + Harmony OS [Huawei]
      + 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]
      + Interim OS
      + 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
      + Knight OS
      + 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
      + Lua RTOS
      + 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]
      + Meetix OS
      + 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]
      + NitrOS-9
      + NLTSS
      + NonStop [Tandem]
      + NOS [Control Data]
      + Nucleus RTOS [Accelerated]
      + Nut/OS
      + Oberon
      + Octa OS
      + 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
      + Solar OS
      + 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 (BTRON, CTRON, eTRON, ITRON, JTRON, microITRON
      + 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]
      + Vinix
      + 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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Comments, corrections, questions? Please drop me an e-mail at:
eylenburg [at] airmail.cc

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