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

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

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