Classic Mac OS, Mac operating systems, OS/2, Palm OS, OS/360 and successors, Mac OS 8, Mac OS 9, FlexOS, Micro-Controller Operating Systems, List of operating systems, Fire OS, Usage share of operating systems, BlackBerry OS, MacOS, OS 2200, Comparison of operating systems, Wear OS, AmigaOS, System 7, OS/VS1, Pop! OS, List of Apple operating systems, OS X Mavericks, 4690 Operating System, History of RISC OS, ChromeOS, HarmonyOS, Operating system, ZFS (z/OS file system), System Settings, Domain/OS, ReactOS, Internet OS, Red Star OS, Mobile operating system, OS X El Capitan, Darwin (operating system), Real-time operating system, High Performance File System, Mac OS X Leopard, Glass OS

List of Microsoft operating systems, TempleOS, MacOS Mojave, Haiku (operating system), Copland (operating system), RedoxOS, Rhapsody (operating system), Cherry OS (operating system), System folder, List of built-in macOS apps, Hobbyist operating system, Mac OS X Snow Leopard, IBM OS/6, LynxOS, Disk operating system, Hierarchical File System (IBM MVS), SharpOS, Embedded operating system, Elementary OS, OS-level virtualization, Maya (operating system), System 1, Just enough operating system, /e/ (operating system), COS (operating system), SystemStarter, KaiOS, Inferno (operating system), Singularity (operating system), Fuchsia (operating system), Syllable Desktop, NixOS, MVS, BrickOS, System Generation (OS), Network operating system, IOS, IBM System/360 Model 50, ZETA (operating system), HiOS, HFS Plus, Hierarchical File System (Apple), Distributed operating system, Solus (operating system), TCP/IP stack fingerprinting, Illumos, NCOS, AROS Research Operating System, IOS version history, Be File System

Classic Mac OS, Mac operating systems, OS/2, Palm OS, OS/360 and successors, Mac OS 8, Mac OS 9, FlexOS, Micro-Controller Operating Systems, List of operating systems, Fire OS, Usage share of operating systems, BlackBerry OS, MacOS, OS 2200, Comparison of operating systems, Wear OS, AmigaOS, System 7, OS/VS1, Pop! OS, List of Apple operating systems, OS X Mavericks, 4690 Operating System, History of RISC OS, ChromeOS, HarmonyOS, Operating system, ZFS (z/OS file system), System Settings, Domain/OS, ReactOS, Internet OS, Red Star OS, Mobile operating system, OS X El Capitan, Darwin (operating system), Real-time operating system, High Performance File System, Mac OS X Leopard, Glass OS, List of Microsoft operating systems, TempleOS, MacOS Mojave, Haiku (operating system), Copland (operating system), RedoxOS, Rhapsody (operating system), Cherry OS (operating system), System folder, List of built-in macOS apps, Hobbyist operating system, Mac OS X Snow Leopard, IBM OS/6, LynxOS, Disk operating system, Hierarchical File System (IBM MVS), SharpOS, Embedded operating system, Elementary OS, OS-level virtualization, Maya (operating system), System 1, Just enough operating system, /e/ (operating system), COS (operating system), SystemStarter, KaiOS, Inferno (operating system), Singularity (operating system), Fuchsia (operating system), Syllable Desktop, NixOS, MVS, BrickOS, System Generation (OS), Network operating system, IOS, IBM System/360 Model 50, ZETA (operating system), HiOS, HFS Plus, Hierarchical File System (Apple), Distributed operating system, Solus (operating system), TCP/IP stack fingerprinting, Illumos, NCOS, AROS Research Operating System, IOS version history, Be File System, System Integrity Protection, Kylin (operating system), System suitcase, THE multiprogramming system, System 6, Oberon (operating system), A2 (operating system), Kernel (operating system), DOS, Android (operating system), Tails (operating system), Unity Operating System, IBM System/370, Symbian, CentOS, Mer (software distribution), Cmd.exe, Microsoft Windows, Unix-like, PlayStation 4 system software, Bada (operating system), PlayStation 3 system software, BlackBerry 10, HyperOs HyperDrive, Issues relating to iOS, Oracle Solaris, Amoeba (operating system), Plan 9 from Bell Labs, Ordnance Survey National Grid, Helios (operating system), Robot Operating System, FTOS, SUPER-UX, Stratis (configuration daemon), TRON project, Xbox system software, Maemo, Mercury Systems, Architecture of Windows NT, Xenix, Green Hills Software, Kiosk software, Novell Embedded Systems Technology, GNU, 64-bit computing, Wii U system software, Linux, Design of the FAT file system, IBM AIX, GEOS (16-bit operating system), Hibernation (computing), Fedora Linux, Premier Election Solutions, Stardock, Nintendo 3DS system software, Live CD, Windows NT, Environment variable, Pick operating system, LAN Manager