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

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

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