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

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

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