Proprietary operating systems

personal computer operating system by Microsoft that was released in 2015

MS-DOS ( ; acronym for Microsoft Disk Operating System, also known as Microsoft DOS) is an operating system for x86-based personal computers mostly developed by Microsoft. Collectively, MS-DOS, its alternate branding as IBM PC DOS, and a few operating systems attempting to be compatible with MS-DOS, are sometimes referred to as "DOS" (which is also the generic acronym for disk operating system). MS-DOS was the main operating system for IBM PC compatibles during the 1980s, from which point it was gradually superseded by operating systems offering a graphical user interface (GUI), in variou

personal computer operating system by Microsoft released in 2021

Unix operating system originally developed by Sun Microsystems

ChromeOS (sometimes styled as chromeOS and formerly styled as Chrome OS) is a proprietary operating system designed and developed by Google. It is derived from the open-source operating system (which itself is derived from Gentoo Linux), and uses the Google Chrome web browser as its principal user interface.

OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing and virtual memory-based operating system. It is designed to support time-sharing, batch processing, transaction processing and workstation applications. Customers using OpenVMS include banks and financial services, hospitals and healthcare, telecommunications operators, network information services, and industrial manufacturers. During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide.

eighth major release of the iOS mobile operating system designed by Apple Inc.

tenth major release of iOS, the mobile operating system by Apple Inc.

seventh major version of iOS

thirteenth major release of iOS, the mobile operating system by Apple Inc.

ninth major release of iOS, the mobile operating system by Apple Inc.

tvOS (formerly Apple TV Software) is an operating system developed by Apple for the Apple TV, a digital media player. In the first-generation Apple TV, Apple TV Software was based on Mac OS X. The software for the second-generation and later Apple TVs is based on the iOS operating system and has many similar frameworks, technologies, and concepts.

Apple mobile operating system

sixth major version of iOS

QNX ( or ) is a commercial Unix-like real-time operating system, aimed primarily at the embedded systems market.

18th major release of iOS, a mobile operating system developed by Apple Inc.

sixteenth major release of iOS, a mobile operating system developed by Apple Inc.

iOS 26 is the nineteenth major release of Apple's iOS operating system for the iPhone. It was announced at the 2025 Worldwide Developers Conference (WWDC) on June 9, 2025, and released on September 15, 2025. The successor to iOS 18, its version number was brought forward to 26 as Apple adopted a year-based convention for consistency across its operating systems.

twelfth major release of the iOS mobile operating system

fifteenth version of iOS, Apple's mobile operating system for iPhone and iPod

seventeenth major release of iOS, a mobile operating system developed by Apple Inc.

eleventh major release of iOS, the mobile operating system by Apple Inc.

MenuetOS is an operating system with a monolithic preemptive, real-time kernel written in FASM assembly language. The system also includes video drivers. It runs on 64-bit and 32-bit x86 architecture computers. Its author is Ville M. Turjanmaa. It has a graphical desktop, games, and networking abilities (TCP/IP stack). One distinctive feature is that it fits on one floppy disk.

SkyOS is a discontinued prototype commercial, proprietary, graphical desktop operating system written for the x86 computer architecture. Its first version was released in 1997, and its last beta build was released in 2008.

discontinued computer operating system

fifth major version of iOS

fourth major version of iOS

86-DOS (known internally as QDOS, for Quick and Dirty Operating System) is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit.

first major version of the mobile operating system by Apple

third version of iPhone OS by Apple Inc.

second major release of iOS by Apple Inc.

thumbnail|An IBM System Z10 mainframe computer on which z/OS can run.

DR-DOS is a disk operating system for IBM PC compatibles, originally developed by Gary A. Kildall's Digital Research, Inc. and derived from Concurrent PC DOS 6.0, which was an advanced successor of CP/M-86. Upon its introduction in 1988, it was the first DOS that attempted to be compatible with IBM PC DOS and MS-DOS.

Single-level store operating system that runs on IBM Power Systems

operating system

operating system

Linux distribution for disk partitioning

system software for the PlayStation 3

graphical operating system (8-bit)

system software

system software for PlayStation Portable

operating system for the Nintendo 3DS handheld game console

OS-9 is a family of real-time, process-based, multitasking, multi-user operating systems, developed in the 1980s, originally by Microware Systems Corporation for the Motorola 6809 microprocessor. It was purchased by Radisys Corp in 2001, and was purchased again in 2013 by its current owner Microware LP.

proprietary operating system of the Nintendo Switch 1 and 2

mainframe operating system originally developed by General Electric in 1962; now owned by Groupe Bull

Real-time operating system

family of fault-tolerant servers

ArcaOS is a proprietary operating system based on OS/2, developed and marketed by Arca Noae, LLC under license from IBM. It was first released in 2017 and builds on OS/2 Warp 4.52 by adding support for new hardware, fixing defects and limitations in the operating system, and by including new applications and tools, and includes some Linux/Unix tool compatibility. It is targeted at professional users who need to run their OS/2 applications on new hardware, as well as personal users of OS/2.

system software for the PlayStation Vita and PlayStation TV video game consoles

real time operating system

operating system

operating system

family of CP/M- and DOS-compatible multi-user multi-tasking operating systems

operating system for Nintendo's Wii U home video game console

real-time operating system

series of operating systems for Data General Eclipse minicomputers

REDIRECT DR-DOS#Caldera

BS2000 is an operating system for IBM 390-compatible mainframe computers developed in the 1970s by Siemens (Data Processing Department EDV) and from early 2000s onward by Fujitsu Technology Solutions.

mainframe operating system

The ETA10 is a vector supercomputer designed, manufactured, and marketed by ETA Systems, a spin-off division of Control Data Corporation (CDC). The ETA10 was an evolution of the CDC Cyber 205, which can trace its origins back to the CDC STAR-100, one of the first vector supercomputers to be developed.