Classic Mac OS, Mac operating systems, OS/2, Palm OS, OS/360 and successors, Mac OS 9, Mac OS 8, FlexOS, List of operating systems, Fire OS, Micro-Controller Operating Systems, Usage share of operating systems, BlackBerry OS, OS 2200, MacOS, Comparison of operating systems, AmigaOS, Wear OS, System 7, OS X Mavericks, List of Apple operating systems, OS/VS1, HarmonyOS, Pop! OS, ChromeOS, 4690 Operating System, History of RISC OS, Operating system, ZFS (z/OS file system), Internet OS, System Settings, Domain/OS, OS X El Capitan, ReactOS, Mobile operating system, Darwin (operating system), Real-time operating system, Red Star OS, Mac OS X Leopard, High Performance File System, List of Microsoft operating systems

MacOS Mojave, Glass OS, TempleOS, Haiku (operating system), Copland (operating system), Rhapsody (operating system), List of built-in macOS apps, Mac OS X Snow Leopard, Cherry OS (operating system), System folder, IBM OS/6, Hobbyist operating system, LynxOS, Elementary OS, Hierarchical File System (IBM MVS), OS-level virtualization, SharpOS, Embedded operating system, Disk operating system, System 1, Maya (operating system), Just enough operating system, /e/ (operating system), KaiOS, COS (operating system), Singularity (operating system), NixOS, Syllable Desktop, Fuchsia (operating system), System Generation (OS), SystemStarter, MVS, Inferno (operating system), Network operating system, BrickOS, IOS, ZETA (operating system), HFS Plus, HiOS, IBM System/360 Model 50, Solus (operating system), Distributed operating system, Hierarchical File System (Apple), TCP/IP stack fingerprinting, Illumos, THE multiprogramming system, NCOS, Be File System, Kylin (operating system), IOS version history

Classic Mac OS, Mac operating systems, OS/2, Palm OS, OS/360 and successors, Mac OS 9, Mac OS 8, FlexOS, List of operating systems, Fire OS, Micro-Controller Operating Systems, Usage share of operating systems, BlackBerry OS, OS 2200, MacOS, Comparison of operating systems, AmigaOS, Wear OS, System 7, OS X Mavericks, List of Apple operating systems, OS/VS1, HarmonyOS, Pop! OS, ChromeOS, 4690 Operating System, History of RISC OS, Operating system, ZFS (z/OS file system), Internet OS, System Settings, Domain/OS, OS X El Capitan, ReactOS, Mobile operating system, Darwin (operating system), Real-time operating system, Red Star OS, Mac OS X Leopard, High Performance File System, List of Microsoft operating systems, MacOS Mojave, Glass OS, TempleOS, Haiku (operating system), Copland (operating system), Rhapsody (operating system), List of built-in macOS apps, Mac OS X Snow Leopard, Cherry OS (operating system), System folder, IBM OS/6, Hobbyist operating system, LynxOS, Elementary OS, Hierarchical File System (IBM MVS), OS-level virtualization, SharpOS, Embedded operating system, Disk operating system, System 1, Maya (operating system), Just enough operating system, /e/ (operating system), KaiOS, COS (operating system), Singularity (operating system), NixOS, Syllable Desktop, Fuchsia (operating system), System Generation (OS), SystemStarter, MVS, Inferno (operating system), Network operating system, BrickOS, IOS, ZETA (operating system), HFS Plus, HiOS, IBM System/360 Model 50, Solus (operating system), Distributed operating system, Hierarchical File System (Apple), TCP/IP stack fingerprinting, Illumos, THE multiprogramming system, NCOS, Be File System, Kylin (operating system), IOS version history, AROS Research Operating System, System suitcase, System 6, DOS, Kernel (operating system), A2 (operating system), Oberon (operating system), Tails (operating system), IBM System/370, Android (operating system), Unity Operating System, CentOS, Symbian, Mer (software distribution), Cmd.exe, Microsoft Windows, Unix-like, PlayStation 4 system software, Bada (operating system), BlackBerry 10, HyperOs HyperDrive, Issues relating to iOS, PlayStation 3 system software, Ordnance Survey National Grid, Amoeba (operating system), Oracle Solaris, Helios (operating system), Plan 9 from Bell Labs, Robot Operating System, FTOS, SUPER-UX, Xbox system software, Stratis (configuration daemon), Maemo, Architecture of Windows NT, Mercury Systems, Xenix, Green Hills Software, Kiosk software, GNU, Novell Embedded Systems Technology, 64-bit computing, TRON project, GEOS (16-bit operating system), IBM AIX, Design of the FAT file system, Hibernation (computing), Linux, Stardock, Wii U system software, Premier Election Solutions, Fedora Linux, Nintendo 3DS system software, Live CD, Environment variable, Windows NT, LAN Manager, Pick operating system, Sprite (operating system), Apple Lisa