Classic Mac OS, Palm OS, System 7, OS/2, OS/360 and successors, Mac OS 8, Mac operating systems, FlexOS, System Settings, Mac OS 9, Fire OS, ZFS (z/OS file system), Pop! OS, OS X Mavericks, OS 2200, 4690 Operating System, BlackBerry OS, Wear OS, MacOS, AmigaOS, HarmonyOS, Glass OS, Red Star OS, Copland (operating system), OS/VS1, High Performance File System, ChromeOS, Darwin (operating system), Operating system, History of RISC OS, Haiku (operating system), System folder, Internet OS, System 1, OS X El Capitan, Usage share of operating systems, Cherry OS (operating system), Mobile operating system, Rhapsody (operating system), Domain/OS, ReactOS

MacOS Mojave, Real-time operating system, Mac OS X Leopard, Micro-Controller Operating Systems, TempleOS, Comparison of operating systems, List of operating systems, List of built-in macOS apps, Singularity (operating system), IBM OS/6, Hierarchical File System (IBM MVS), Disk operating system, RedoxOS, Elementary OS, /e/ (operating system), Hobbyist operating system, Inferno (operating system), Mac OS X Snow Leopard, List of Apple operating systems, OS-level virtualization, SharpOS, Maya (operating system), Just enough operating system, COS (operating system), SystemStarter, System suitcase, KaiOS, System 6, Fuchsia (operating system), System Generation (OS), HiOS, Syllable Desktop, LynxOS, Hierarchical File System (Apple), THE multiprogramming system, Solus (operating system), IBM System/360 Model 50, ZETA (operating system), AROS Research Operating System, NixOS, Network operating system, List of Microsoft operating systems, Kylin (operating system), Be File System, IOS, Distributed operating system, Embedded operating system, Unity Operating System, MVS, BrickOS

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