- ALXERS Corporation
- ALXERS OS
- ALXERS OS 26
- ALXERS OS 27
- ALXERS OS 7
- ALXERS OS 8
- ALXERS OS 9
- ALXERS OS Interga
- ALXERS System Manager 79
- ALXERS X/DOS
- Android
- AndroidPPC
- Android 14D
- Android 15
- Android 16
- Android BetterMIPS
- Android Upside Down Cake/Easter Egg
- Apollo 2000
- ArcOS 1.0
- Binbows 1.0
- BlazeOS
- Blinkbook
- CASCADES Corporation
- Cardinal Computing
- Chilled Windows
- ChillysMM2 OS
- Codename Project Denver
- Colop 1
- CosmOS 1.0
- Crows 2026
- DOS.com
- Daydream Corporation
- Debugging System for Macintosh Prototypes
- Development of Windows 2008
- Doors
- Doors XP
- Dreamcast OS
- EchoOS
- EclipseOS 1.0
- EclipseOS 11.06
- EclipseOS 11.12
- EclipseOS 12.06
- EclipseOS 12.12
- EclipseOS 13.06
- EclipseOS 13.12
- EclipseOS 2.0
- Eclipse 10.06
- Eclipse 10.12
- Eclipse 3.0
- Eclipse 4.0
- Eclipse Operating System
- Edge OS
- Embedded POSReady 6
- End-of-Life Table
- Estania
- Exant Incorporated
- Fluent OS 1
- Frames for DOS/MCI 3.0
- GUI for Soviet Computers 1.0
- GyatOS Ohio
- Hairoad OS 1
- Hairoad OS 2
- IBM Arcant
- IOS 19
- Internet Explorer OS
- Internet Explorer OS 2.0
- Ios
- JaguarOS 1.0
- JaguarOS Alpha
- JaguarOS Test Release 1
- Jaguar OS 2.0
- JupiterOS
- KawaiiSoft
- Kiffoden Minu
- KittenOS
- LavaOS
- LavaOS 1.0
- LavaOS 1.0/LavaOS Store
- LavaOS 2.0
- LavaOS 2.1
- LavaOS 3.0
- LavaOS 4
- LavaOS 6
- LavaOS 7
- LavaOS 8
- LavaOS S
- LeopardOS 1.0
- Little John's Windows
- Live PocketOS
- MAC/X
- MacOS 18 Grizzly
- MacOS Azusa
- MacOS Vinson
- Mac OS 9 for Legacy Platforms
- Mac OS NeXTSTEP
- Magnesium 1.0
- Magnesium 2.0
- Magnesium 2.1
- Magnesium 3.0
- Magnesium 3000
- Magnesium 4000
- Magnesium 4001
- Magnesium 5
- Mainframe Systems
- MandoorCom OS
- MandoorCom OS 1.0
- MandoorCom OS 2.0
- Mandoor Corporation
- Mandoor Corporation/CPU Lines
- Mandoor Corporation/CPU Lines/Palatnium/X5990
- Mandoor Corporation/CPU Lines/Platinium 5 5670
- Mangus Technologies
- MarcoOS Corporation
- Megasoft
- Michaelsoft Binbows
- Microcom
- MicrosoftGUI
- Microsoft Avian
- Microsoft Azure ∞
- Microsoft Choacury
- Microsoft GEN
- Microsoft Neptune Revision 2004
- Microsoft Operating System for IBM Computers
- Minisoft
- MuOS
- Multitech, Inc.
- Netium (operating system)
- OS/2 Uta
- OS/2 Warp 5
- OS/362
- OS Ready Technicolor
- Odyssey server family
- Oggosoft
- One OS
- OpenNT 2006
- OpenSeal
- OpenSeal 1.0
- OpenSys
- OperaOS Mini Mobile
- Operating system mockups
- Paracomm Electronics, Inc.
- PhoenixOS
- PocketPC 95
- PocketPC 98
- Polaris OS (2994)
- PrismOS 1.0
- Quantum kernel
- Real Windows Operating Systems
- Real macOS Operating Systems
- RedStarOS 5.0
- ResurrectionOS
- Resurrection Incorporated
- RevibeOS
- ReviveOS
- ReviveOS 1.0
- ReviveOS 2.0
- ReviveOS 3.0
- ReviveOS 4.0
- ReviveOS 5.0
- ReviveOS 7
- ReviveOS 8
- ReviveOS Lava
- ReviveOS Quantum
- ReviveOS Quantum/build 1335
- ReviveOS Ruby
- ReviveOS Workstation 3.0
- ReviveOS Workstation 5.0
- ReviveOS X
- River
- River 13
- Sasti
- SealOS Workstation 1.0
- Silverstar-Tempest Software Corporation
- Skyblue
- SkyblueOS 3.3
- Skyblue Graphical Manager 0.01 (Prototype 0.01)
- Softonium Corporation
- Spurdows xDDDDD
- SunOS
- Sunbird UI 7.0
- System Software for Apple III
- Tehachapi BSD
- TfosorciM
- The ALXERS Graphical Manager 1.x
- The ALXERS Graphical Manager 2.x
- The ALXERS Graphical Manager 6.x
- Traum Corporation
- UltraDOS
- Unified Shell
- United States Government System (USID)
- UnixWare 8
- Vanura
- Vanura -∞
- Vanura 3155 B.C.
- VertexOS 1.0
- Viewfinder Corporation
- Vindaugus 1000
- Visual history of Minderian WNRs
- Widus ohio
- WikimediaOS
- WinDOS
- WinKernel
- Windo (character)
- Windows(OS)/27H1
- Windows: Rodrick Edition
- Windows: Wimpy Edition
- WindowsME 4.98.4000
- WindowsScape
- Windows '01
- Windows -3.30
- Windows -4.00
- Windows 1.5
- Windows 1.6
- Windows 1.7
- Windows 10.1
- Windows 10.5
- Windows 10.5X
- Windows 100.09
- Windows 10000
- Windows 10Y
- Windows 10 LE
- Windows 10 MobileShell
- Windows 10 Release Preview
- Windows 11.5
- Windows 11.673 SE
- Windows 111
- Windows 11X
- Windows 11X 23H1
- Windows 11 Mobile
- Windows 12
- Windows 12.1
- Windows 12.3
- Windows 12X
- Windows 12 Mobile
- Windows 12 SE
- Windows 13
- Windows 13X
- Windows 14
- Windows 15
- Windows 15X
- Windows 16
- Windows 17
- Windows 18
- Windows 19
- Windows 2.03 TrueQuality
- Windows 2.2
- Windows 20
- Windows 2002 Legacy
- Windows 2003
- Windows 2004
- Windows 2005
- Windows 2008
- Windows 2009
- Windows 2011
- Windows 2011 Service
- Windows 2014
- Windows 2016
- Windows 2016 Mobile
- Windows 2020
- Windows 2022
- Windows 2023
- Windows 2024 (British Mainland)
- Windows 2030
- Windows 2050
- Windows 21
- Windows 2100
- Windows 215
- Windows 22
- Windows 23
- Windows 24
- Windows 25
- Windows 26
- Windows 3.05
- Windows 3.1/Test Release
- Windows 3.1 with Game Development Software March 1991
- Windows 3.3
- Windows 3.5x
- Windows 30
- Windows 3000
- Windows 31
- Windows 33
- Windows 33.1
- Windows 33.9
- Windows 33 SE
- Windows 39
- Windows 3ME
- Windows 40
- Windows 4000
- Windows 40th Anniversary Pack
- Windows 5
- Windows 50
- Windows 51
- Windows 6
- Windows 6.1
- Windows 7.1
- Windows 7.5
- Windows 7.8
- Windows 7 2023 Edition
- Windows 7 Lite
- Windows 7x
- Windows 8.15
- Windows 8.2
- Windows 8.4
- Windows 8.6
- Windows 85
- Windows 9
- Windows 9.1
- Windows 91
- Windows 92
- Windows 95 16-bit Legacy Edition
- Windows 95 Enterprise
- Windows 95 Server
- Windows 97 Service Pack 2
- Windows 98 Server
- Windows 99
- Windows Aperture
- Windows Avernus
- Windows Axcel
- Windows Axcel 2.0
- Windows Blackmore
- Windows Bluefire
- Windows Borealis
- Windows Bronze
- Windows Buffalo
- Windows Bull
- Windows CON
- Windows Castleton
- Windows Centennial
- Windows Chilliwack
- Windows Club Penguin
- Windows Cocaine Edition
- Windows Codename "Finale"
- Windows Codename Arlington
- Windows Codename Cairngorm
- Windows Codename Delta 10
- Windows Codename Embassy
- Windows Codename Everest
- Windows Codename Natura
- Windows Codename Pharos
- Windows Codename Stake
- Windows Cool
- Windows Core
- Windows Core OS Family
- Windows Decade
- Windows Deserving
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