Soviet version of CP/M-86. All commands are in Russian.

Russia

CP/M like operating system.

Mostek, USA

Virtual Machine/Enterprise Systems Architecture.

IBM, USA

Embedded firewall distribution of FreeBSD, one of the BSD operating system descendants.

Operating system for the Apple Macintosh.

Apple, USA

First officially-named Mac OS.

Next version of Apple's highly proprietary OS, was not based on the Copland development project, but on a cross with NeXTStep called Rhapsody (which up to Dev release 2 was available for PCs), and is designed to have the friendly MacOS graphical layer over 4.

Apple, USA

Separately sold operating system add-on which provides additional server programs along with management and administration tools for macOS.

Apple, USA

Mansfield and Cahlander Executive. SCOPE competing operating system. Original name for CDC KRONOS OS.

Control Data, USA

Kernel developed at Carnegie Mellon University to support operating system research, primarily distributed and parallel computing.

Carnegie-Mellon University, USA

Unix-like OS, a commercial version of 4.4BSD using Mach on 680x0 and PPC MacIntoshes.

Tenon Intersystems, USA

Formerly Mac OS X and OS X.

Apple, USA

Formerly Mac OS X Server and OS X Server. separately sold operating system add-on which provides additional server programs along with management and administration tools for macOS.

Apple, USA

Apple Lisa computer program which shipped with the Macintosh XL. It allowed 64K Apple Macintosh ROM emulation so the Macintosh XL could run classic Mac OS programs.

Apple, USA

Software platform developed by Nokia for smartphones and Internet tablets.

Nokia, Finland

Next-generation operating system for the most performant embedded hardware available today. Maestro is designed specifically for multi- and many-core processors and provides reliable parallelism to application developers.

Hipperos, Belgium

OS for SMEP computers based on ERC-RAPOS.

Russia ?

Magic Communicating Applications Platform. Discontinued object-oriented operating system for PDAs.

General Magic, USA

Unix-like BSD based operating system.

Juraj Sipos, Slovakia

Formerly yellowTAB ZETA. Based on BeOS source code.

yellowTAB, USA

First Soviet operating system.

Russia

Open source microkernel based operating system with POSIX complience.

Manish Regmi, Nepal

OpenBSD live CD.

France

Sophisticated, modern RTOS and application development platform, targeted towards a growing list of today's most compelling embedded devices.

Disk operating system developed for models 20 and 40 of Mitsubishi Electric's MELCOM-3100.

Mitsubishi, Japan

Disk operating system developed for model 40 of Mitsubishi Electric's MELCOM-3100.

Mitsubishi, Japan

Disk operating system developed for models 20 and 40 of Mitsubishi Electric's MELCOM-3100.

Mitsubishi, Japan

Hard Real-Time Operating System for embedded applications that follows the Minimal Real-Time POSIX.13 subset.

University of Cantabria, Spain

OpenIndiana/Illumos based Solaris distribution for reviving SPARC hardware support.

Martin Bochnig, Germany

Operatingsystem for Control Data 3300/3500.

USA

Soviet RT-11 clone.

Novocherkassk Polytechnic Institute, Russia

Batch disk operating system with real-time extensions.

Same as MAX I,II with multiple interactive users.

Same as MAX I,II with multiple interactive users. Take advantage of the new features of the MODCOMP IV.

Real-time monitor for a fixed set of processes linked into a single memory image.

Modular Computer Systems, USA

Disk operating system for the ZX Spectrum MB02 disk interface.

MDV, Busysoft, Russia

Multitasking version of BOS/5.

USA

Master Control Program.

Burroughs, USA

Master Control Program. Was the control program for Fujitsu's medium general-purpose computers FACOM 230-20 and FACOM 230-30.

Fujitsu, Japan

Multiple Console Time Sharing System. Developed to support CAD applications at GM.

General Motors, USA

Operating System for the Data General MV4000.

USA

Distributed Operating system.

USA

Single user OO Operating System for the Lilith Computer, developed with Modula-2 modules. programming.

S. E. Knudsen, ETHZ, Switzerland

Burroughs Master Control Program. Proprietary operating system of the Burroughs small, medium and large systems, including the Unisys Clearpath/MCP systems.

Burroughs, USA

Operating system for Cm* Research Multiprocessor.

Carnegie-Mellon University, USA

From merger of Maemo & Moblin.

Operating system for a multiprocessor supercomputer, built from multiple 68000s and a VAX. Provides virtual circuits for two-way and broadcast messages.

USA

Unix-like transputer operating system developed for the Computing Surface.

Meiko, UK

Successor to MLNX-OS. High performance, flexible and cloud-scale switch operating system, designed for the demands of next-generation data centers.

Mellanox, USA

32-bit version of MenuetOS.

64-bit version of MenuetOS.

Extremely compact OS with GUI, written entirely in FASM assembly language.

Ville M. Turjanmaa, Finland

Operating system for the MERIT network.

Eric Aupperle, USA

Mini OS for 68000 computers.

Silicon Valley Software, USA

Project of a Self-based OS.

Jecel Mattos de Assumpcao Jr, Brazil

Multi-Environment Real-Time. Was a hybrid time-sharing/real-time operating system developed for use in embedded minicomputers (in particular PDP-11s). It was later renamed UNIX Real-Time (UNIX-RT).

Bell Labs, USA

Object-oriented system model.

University of Victoria, Canada

Original Multi-programming with a Fixed number of Tasks, replaced by MFT II. See OS/MFT.

IBM, USA

Multi-Programming with a Fixed number of Tasks, had up to 15 fixed size application partitions, plus partitions for system tasks, initially defined at boot time but redefinable by operator command.

Time-sharing system for the IBM S/360-67 and successors.

University of Michigan, USA

Free DOS like Operating System which fits on one floppy disk. The new Micro OS X is the third generation of Micro OS. The Micro OS X Workspace Manager is based on GEM Desktop.

Bjoern Schnackenbeck, Germany

Derivated from RSX-11.

Micro-Controller Operating Systems. Small pre-emptive priority based multi-tasking kernel.

Micrium, USA

Operating system for MS2000.

RCA, USA

Operating system for TRS-80 not using a command shell like TRSDOS but used extensions to BASIC. MICRODOS had no file system. All disk accesses were made using the starting sector and length.

Percom, USA

Soviet counterpart to CP/M-80. Compatible with versions 2.2 and 3.1.

MIIPU, Russia

Small Pascal Operating Environment for the LSI-11.

DEC, USA

Distributed OS for MICRONET, a reconfigurable network computer.

USA

Toolkit for building systems for invisible computing and embedded web services.

Microsoft, USA

Version of VMS for the MicroVAX.

DEC, USA

Forked from FreeBSD 6.1.

Operating system used by the czech SAPI-1 microcomputer.

Managed code operating system. a possible commercial implementation of the Singularity operating system

Microsoft, USA

Operating system for the TOSBAC Kanji office computer.

Toshiba, Japan

Operating system for the Atari ST.

Milan Computersys., Germany

Multitasking-capable operating system for the Atari ST.

Milan Computersys., Germany

Preemptive operating system for small microprocessors.

Milos, Italy

Formerly Damn Small Solaris. Small size Live CD based on OpenSolaris.

Alexander Eremin, Russia

Basic Operating System for the ModComp Computers.

USA

First true major re-write of QDOS.

Laurence Reeves, UK

Portable executive for 8-bit microcomputers.

USA

Multi-Access OS.

USA

Didactic Linux-like kernel. Multi-threading operating system for IA-32 architecture.

Andrea Righi, Italy

"Cut down" UNIX v6 for the low-end PDP-11/10.

Bell Labs, USA

POSIX-compliant (since version 2.0), Unix-like operating system based on a microkernel architecture.

Operating system for DEC minicomputers.

ITC, Romania

Small real time operating systema applied to an onboard project for General Aviation. . The focus of the operating system is predictability, stability, safety and simplicity.

ETHZ, Switzerland

free software alternative operating system kernel for the Atari ST system and its successors.

Atari, USA

Operating system for HITAC L-30 and 50 series of office computers.

Hitachi, Japan

Operating system for HITAC L-70 series of multifunctional office computers.

Hitachi, Japan

Operating system kernel designed to run on 32bit microcontrollers.

Multum In Parvo Operating System. Cooperative multitasking RTOS designed for single-chip micro-controllers with severely limited RAM (e.g. less than 256 bytes) and ROM. It provides the flexibility of an RTOS in low-cost embedded designs.

Antonino Calderone, Italy

Discontinued UNIX operating system developed by MIPS Computer Systems, Inc. from 1985 to 1992, for their computer workstations and servers

MIPS Computer Systems, USA

Multitasking Real-time OS for 68000 series.

USA

Originally called MirBSD. Free and open source operating system which started as a fork of OpenBSD.

Multipurpose Interactive timeSharing System. First Soviet UNIX-like operating system.

Physical Faculty of Moscow State University, Russia

Hybrid real-time energy-efficient operating system for the resource-constrained wireless sensor nodes.

Wuhan University, Blaise Pascal University, China/France

Micro Indutrial TRON. OS for Small embedded systems.

Japan

Operating system developed for its Whirlwind computer. Also used for the UNIVAC 1103. The first example of a Job Control Language (JCL) driven operating system.

MIT, USA

Multi-Job Control System. Enabled the user to perform real-time inquiry operations from up to 16 terminals (electric typewriters) directly connected to the main unit.

Toshiba, Japan

Was one of the most widespread operating systems for Elektronika BK personal computers.

Mikhail Korolev, Dmitriy Butyrskiy, Russia

Open source computer operating system started by the Open Software Foundation Research Institute and Apple Computer.

Apple, Open Software Foundation Research Institute, USA

Network operating system based on Debian.

Mellanox, USA

Experimental OS kernel, developed in the context of The Express project, constructed by porting the SML/NJ implementation of Standard ML to run on a bare PC through the OSKit library for the low-level machine management.

Olin Shivers, USA

Para-virtualised guest operating system for less complex systems which provides the ARINC 653 P4 subset as a lightweight alternative to LithOS (P1) for embedded real time operating systems used in avionics.

FentISS, Spain

MobilNaya Operatsionnaya Sistema. One of the most widely distributed OS UNIX type in the Soviet Union.

IPK Minavtoproma, DEMOS Co-operative, Russia

Linux kernel operating system targeted to smartphones.

MonteVista Software, USA

Small 32-bit operating system for Intel i386 processors and above, running in protected mode. In its current state it comprises a small kernel (some might call it a microkernel), a set of drivers for basic PC hardware and a couple of applications. It is called The Möbius because it is hard to type*.

Tim Robinson, UK

Series of operating systems for the NEAC-series 2200, which was developed in technical collaboration with Honeywell.

NEC, Honeywell, Japan

Had functions (e.g., stacked job processing) to effectively use multiple programs (4 programs) and a large computer system in addition to the functions of MOD I-TR and MSR.

Capable of easily performing inline processing and online processing due to NOSS-7 (NEAC Online Software System) in addition to batch processing with a system centered on a magnetic disk device.

Had a multi-program processing function in which conversion of one set of data for individual job control and batch programming were performed simultaneously, together with a function to effectively operate a system centered on a magnetic tape device.

Had a function to effectively operate a system centered on a high-speed magnetic drum device in addition to the functions of MOD IV.

Developed as an operating system that could support multiple processors (dual systems sharing the main memory) for model 700 of the NEAC-series 2200.

Operating system for the Honeywell Series 200.

USA

Operating system for the Honeywell VPS 6.

USA

Operating system for the MELCOM 3100 series of computers. This operating system used magnetic tapes as external storage and were developed by systematically organizing and enhancing the system programs built up with MELCOM-1530.

Mitsubishi, Japan

Operating system for the MELCOM 3100 series of computers. This operating system used magnetic tapes as external storage and were developed by systematically organizing and enhancing the system programs built up with MELCOM-1530.

Mitsubishi, Japan

Operating system for the MELCOM 3100 series of computers. This operating system used magnetic tapes as external storage and were developed by systematically organizing and enhancing the system programs built up with MELCOM-1530.

Mitsubishi, Japan

Portable, modular OS.

University of Warwic, UK

Operating system for Computer Technology minicomputers.

USA

Minds Of Embedded system. Event-driven OS for 8/16/32-bit MCUs.

China

Monash University Educational Computing System. Was a computer operating system with BASIC, COBOL, FORTRAN, Pascal interpreters, plus machine language facility.

Monash University, Australia

Open source Operating System for Internet of Things.

Cesanta, Ireland

Operating system for the SDS 9000 computer.

Scientific Data Systems, USA

First control program for FACOM 230-50, developed through improving FONTAC MONITOR. for batch processing based on a magnetic tape.

Fujitsu, Japan

Control program for batch processing based on a magnetic drum unit. Job stacking function was added to achieve increased batch processing efficiency.

Fujitsu, Japan

Oerating system for Fujitsu’s large general-purpose computer FACOM 230-60.

Fujitsu, Japan

Embedded firewall distribution of FreeBSD. It provides a small image which can be put on Compact Flash cards as well as on CD-ROMs and hard disks.

Manuel Kasper, Switzerland

Embedded Linux.

MonteVista Software, USA

AmigaOS-like computer operating system. It is a mixed proprietary and open source OS produced for the Pegasos PowerPC processor based computer, PowerUP accelerator equipped Amiga computers.

Master OS for Varian minicomputers. Tape or disk based batch system.

USA

Minimum Operating System. Card-based batch monitor for Univac 9200, 9300.

USA

Multiprogramming OS for NCR Century 300 computer.

USA

p-code system for Z80, 8080, 8086, 68000.

Volition Systems, USA

An early version of MOSIX. Controls four linked PDP-11s.

USA

Mobile Operating System. Soviet RIAD mainframes operating system.

Russia

Object oriented operating system.

Julian R. Hall, UK

Distributed version of UNIX supporting full transparency and dynamic process migration for load balancing.

Hebrew University of Jersusalem, Israel

Modular OS for the RCA SUMC Computer (Space Ultrareliable Modular Computer). A realtime OS designed to be modifiable.

S&H Computing, USA

Linux kernel-based mobile operating system.

Motorola, USA

Common Lisp OS development platform.

Frode V. Fjeld, Norway

Operating System for microNOVA-based computers.

Data General, USA

Multi-Programming Monitor Control Program. Discontinued multi-user version of the CP/M operating system.

Digital Research, USA

Dual-processor variant of MP/M for 8086 and 8080 CPUs.

MP/M II 2.0 added file sharing capabilities to MP/M.

Multi-user version of CP/M-86.

Version of MP/M with networking facilities.

Digital Research, USA

Memory-resident, diskless version of MP/NET.

Digital Research, USA

Version of AOS for the Data General Micro-Nova.

USA

HP Multi-Programming Executive.

Hewlett-Packard, USA

HP Multi-Programming Executive. PA-RISC version.

HP Multi-Programming Executive. MPM renamed in 1992.

Operating system for HP 3000.

USA

Multi Programming eXecutive. First IBM system to provide multiple fixed partitions into which programs could be scheduled on the basis of external events, time-of-day clock, time interval, operator command and the batch job control language.

IBM, USA

Operating system for Gould Concept-32 computers.

USA

Message Queue eXecutive. Real-time operating system developed by Precise Software Technologies Inc., and currently sold by Synopsys, Embedded Access Inc, and Freescale.

Precise Software Technologies, USA

Small memory-resident OS for the Motorola 68000.

USA

Or The RL Monitor System. Discontinued operating system developed for the PDP-8. It was submitted to DECUS in 1970.

Richard F. Lary, USA

Microsoft's DOS variant for OEM, developed jointly with IBM, versions 1.x–6.22 Microsoft's now abandoned DOS variant.

Microsoft, USA

First release for non-IBM hardware.

Introduced features from Unix such as subdirectories, handle-based file operations, command input/output redirection, and pipes.

Adds support for 1.2MB floppy disks and larger hard disks .

Supported two hard disk partitions of up to 32MB, one primary and one "logical drive" in an "extended partition" .

Supported multiple logical drives.

Actually derived from IBM's codebase rather than the reverse .

In response to DR-DOS 5.0, adds comparable features to that product: memory management, full-screen editor, QBasic programming language, online help, and DOS Shell gains task switcher.

Response to DR-DOS 6.0. Added DoubleSpace disk compression (copied from Stacker) and other features .

Following Stac lawsuit, removed DoubleSpace disk compression .

Last official stand-alone version. DoubleSpace replaced with non-infringing but compatible DriveSpace tool .

Shipped embedded in Windows 95. Included large disk (LBA) and Long File Name (LFN) support .

Shipped embedded in Windows 95B (OSR2) (and Windows 98 in June 1998). Added support for FAT32 file system .

Shipped embedded in Windows ME. Last version of MS-DOS. Removes SYS command, ability to boot to command line and other features .

Mass storage OS supporting real-time plus batch processing for the CDC System 17.

USA

Multitasking system Program. Real-time executive for 68000 and Z8000. Uses a "split onion" structure with access to all layers.

Hemenway, USA

Maintenance and Support Program. Successor to OS-IV, now MSP/EX also known as Extended System Architecture (EXA), for 31-bit mode.

Fujitsu, Japan

Modular System Program 7. Real-time OS for the IBM System/7.

USA

MSX-DOS. Developed by MS Japan for the MSX 8-bit computer.

Microsoft, USA

Magnetic Tape OS for Computer Automation Alpha LSI & Naked Mini LSI.

Computer Automation, USA

Small real-time kernel for Z80, 6502, 6800, 8086, 68000.

United States Software, USA

Magnetic Tape OS for Datapoint 1100, 2200, 5500.

Datapoint, USA

Multitasking, Multiprocessing OS for 8086 and 68000 families.

Industrial Programming, USA

Macro TRON. Network-based control over other architectures.

Japan

Michigan Terminal System, developed by a group of universities in the US, Canada, and the UK for the IBM System/360 Model 67, System/370 series, and compatible mainframes.

IBM, USA

Magnetic Tape System for HP 2100.

USA

Operating system for the MU5 computer.

University of Manchester, UK

Open Source microkernel.

University of Applied Sciences Rapperswil, Switzerland

Multiplexed Information and Computing Service. Operating system (written in PL/I) whose design began in the late 60's, co-written by MIT, AT&T Bell Labs and GE, that was meant to become the be-all-end-all of OS technology by having just every (un)imaginable feature, and that was supplanted by Unix, despite the fact that Multics was much better(?) designed, because Unix' simple and stubborn design was much more adapted to the very resource-poor architectures of the time. Originally developped for the GE-645 and later the Honeywell 6180.

MIT, GE, Bell Labs, USA

Last version. In 2006 Bull HN released the source code to MIT.

Disk Operating System for the Tandy TRS-80. Features ability to read and write various file formats. Briefly advertised as ULTRA-II.

Cosmopolitan Electronics, USA

Originally known as MULTIDOS 80/64.

FORTH operating environment for the 68000.

Creative Solutions, USA

J variant that allowed interactive access.

International Computers Limited, UK

Operating system based on the concurrently developed implemenation of POP-2; Multipop employed no conventional hardware protection mechanisms: its security was guaranteed by accessing system resources via closures of device access functions, and on built in restrictions on code generation embodied in the compiler (an ancient example of a no-kernel system).

Robin Popplestone, USA

Discontinued business-oriented mainframe computer real-time operating system. While initially a mini-mainframe, the final high-end systems supported 12 CPUs and over 2000 simultaneous users.

Hewlett-Packard, USA

Successor of Concurrent DOS 386. Commercial DOS clone by Concurrent Controls.

Concurrent Controls, USA

Multi-user multiprogramming, database oriented OS for DEC computers.

USA

Operating system project that originally proposed a one global distributed shared memory, aka a single address space or SAS (starting with 64-bit virtual address space).

University of South Wales, Australia

Multi-User, Multi-Task Disk System.

muPro Inc., USA

McGill University System for Interactive Computing. Operating system developed for the S/370, running normally under VM.

McGill University, USA

Multi-User System for Interactive Computing/System Product. Operating system developed for the S/370, running normally under VM.

McGill University, USA

Operating system designed to emphasize portability.

USA

MVS supported Enterprise System Architecture, horizontal addressing extensions: data only address spaces called Dataspaces. A Unix environment was available starting with MVS/ESA V4R3.

IBM, USA

MVS System Extensions.

MVS/System Extensions R2.

Generic term for all versions of the MVS operating system prior to MVS/XA.

MVS System Product.

MVS/Extended Architecture. MVS supported eXtended Architecture, 31-bit addressing.

MVS Enterprise System Architecture. Version of MVS, first introduced as MVS/SP Version 3.

Multi-Programming Variable Tasks. Had up to 15 application regions defined dynamically, plus additional regions for system tasks

IBM, USA

Virtual machine system for modified IBM 7044. An early exploration of virtual machine ideas.

Model 65 Multiprocessing (M65MP) is a variant of MVT. It runs on a 360/65.

Implementation of the Scheme programming language for Windows 95/98/NT, MacOS, Unix, and BeOS. Available in kernel form for x86 machines, which allows MzScheme to boot without the aid of a separate operating system.

Rice University, USA