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

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