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