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