Classic Mac OS, System 7, Palm OS, OS/360 and successors, OS/2, 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, BlackBerry OS, 4690 Operating System, Wear OS, MacOS, AmigaOS, HarmonyOS, Red Star OS, Glass OS, OS/VS1, Copland (operating system), High Performance File System, History of RISC OS, System folder, Darwin (operating system), ChromeOS, System 1, Operating system, Haiku (operating system), Usage share of operating systems, Cherry OS (operating system), Internet OS, Rhapsody (operating system), OS X El Capitan, Mobile operating system, Domain/OS, MacOS Mojave

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

Classic Mac OS, System 7, Palm OS, OS/360 and successors, OS/2, 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, BlackBerry OS, 4690 Operating System, Wear OS, MacOS, AmigaOS, HarmonyOS, Red Star OS, Glass OS, OS/VS1, Copland (operating system), High Performance File System, History of RISC OS, System folder, Darwin (operating system), ChromeOS, System 1, Operating system, Haiku (operating system), Usage share of operating systems, Cherry OS (operating system), Internet OS, Rhapsody (operating system), OS X El Capitan, Mobile operating system, Domain/OS, MacOS Mojave, ReactOS, Micro-Controller Operating Systems, TempleOS, Real-time operating system, Comparison of operating systems, Mac OS X Leopard, List of operating systems, Singularity (operating system), List of built-in macOS apps, Hierarchical File System (IBM MVS), RedoxOS, Disk operating system, /e/ (operating system), Elementary OS, IBM OS/6, Hobbyist operating system, Inferno (operating system), List of Apple operating systems, SharpOS, Mac OS X Snow Leopard, Just enough operating system, Maya (operating system), COS (operating system), OS-level virtualization, SystemStarter, KaiOS, System suitcase, System 6, System Generation (OS), HiOS, LynxOS, Fuchsia (operating system), Syllable Desktop, THE multiprogramming system, NixOS, IBM System/360 Model 50, Hierarchical File System (Apple), Solus (operating system), AROS Research Operating System, ZETA (operating system), List of Microsoft operating systems, Network operating system, Be File System, Kylin (operating system), Embedded operating system, Distributed operating system, IOS, BrickOS, Unity Operating System, MVS, Illumos, NCOS, Oberon (operating system), IOS version history, HFS Plus, PlayStation 4 system software, Android (operating system), TCP/IP stack fingerprinting, IBM System/370, 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, 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), Maemo, Plan 9 from Bell Labs, TRON project, Xenix, GNU, Architecture of Windows NT, GEOS (16-bit operating system), Green Hills Software, Pick operating system, Sprite (operating system), Nintendo 3DS system software, Fedora Linux, HyperOs HyperDrive, Design of the FAT file system, IBM AIX, 64-bit computing, Linux, Novell Embedded Systems Technology, Hibernation (computing), System 7 (disambiguation), Bharat Operating System Solutions, Environment variable, Weave (protocol), Live CD, LAN Manager, Apple Lisa