O/OS [MIA] introduces a new GUI concept, and aims at architecturing the OS around reusable, replacable components.

Frank Kudermann, Germany

Operating system for Intel 8086 and M68000.

Applied Systems, USA

Renamed THEO in 1983. The first multi-user operating system for 8-bit microprocessor based computers (Z-80 from Zilog).

Phase One Systems, USA

Modular, single-user, single-process, multitasking operating system written in the programming language of the same name. Written in Oberon by Niklaus Wirth.

ETH Zurich, Switzerland

Internal use at ETHZ.

Active Object System (formerly Active Object System), laterr renamed to A2).

Re-implementation of the original Oberon System in FPGA.

Project to create a public-licensed implementation of an operating system similar to UNIX.

See DR-DOS.

USA

Distributed microkernel OS that transparently migrate light-weight processes ("shuttles") over the network, communicating by distributed IPC ("Portals"), in a one global distributed shared memory space.

University Carlos III of Madrid, Spain

The third version of the system (known as Off++v2) is rather different from the original design and is named Plan B.

Wang Office Information System. Successor to the WPS. Combined the WPS and VP/MVP systems.

Wang Laboratories, USA

Original J Operating System, aka Platypus.

Open Kernel Environment. Extension to the Linux OS which allows users other than root to load native and fully optimised code in the kernel.

Leiden University, Netherlands

Flexible, high performance microkernel suitable for many sys- tems from embedded through to enterprise.

Open Kernel Labs, USA

LiveCD based on OpenBSD 3.8.

Gabriel Paderni, France

Win32 API Compatible RTOS for 32/64-bit x86 Embedded Systems sucha as governor of steam turbines, motors controls.

On Time Informatik, Germany

Adaptation of UNIX, Version 7.

Onyx, USA

OnixOS Arch is a Linux-based and open source distribution.

USA

Yet another distributed single (wide) address space (SAS) OS with page-level protection, implemented on top of Mach on Alphas.

Hank Levy, Ed Lazowska, Jeff Chase, Mike Feeley, USA

Open Network Linux. Linux distribution for open hardware switches based on Debian.

Open Source networking OS by Novell. Can incorporate either SUSE Linux or Novell NetWare as its kernel.

Novell, USA

Genera sold by Symbolics.

Symbolics, USA

Cleanroom implementation of a microkernel.

Forked from NetBSD. Unix-like OS of the BSD family, has split from NetBSD, and focuses on stability and security.

Or Yocto Project. Build automation framework and cross-compile environment used to create Linux distributions for embedded devices.

Embedded Parallel Operating System.

Brazil

Operates under the illumos Foundation. Uses the illumos kernel, which is a derivative of OS/Net, which is basically an OpenSolaris/Solaris kernel with the bulk of the drivers, core libraries, and basic utilities.

Sun Microsystems, USA

Operating system for smartphones developed by the Openmoko project. It is based on the Ångström distribution, comprising various pieces of free software.

Storage appliance based on NAS4Free and FreeBSD.

France

Provides a commercial license for Amazon FreeRTOS. This includes a license for the FreeRTOS kernel as well as, if needed, the additional software libraries that make up Amazon FreeRTOS.

Real Time Engineers, USA

Discontinued, open source computer operating system based on Solaris.

Sun Microsystems, USA

Early operating system.

IBM, USA

Object-oriented application programming interface (API) specification for a legacy object-oriented operating system, with the basic goal of offering a NeXTSTEP-like environment on a non-NeXTSTEP operating system.

NeXT, Sun Microsystems, USA

Formerly SUSE Linux and SuSE Linux Professional, is a Linux distribution sponsored by SUSE Linux GmbH and other companies.

Open source network operating system that originated with Hewlett Packard Enterprise (HPE), is now under the wing of the Linux Foundation.

Hewlett-Packard, USA

Opensolaris based distribution.

Martin Bochnig, Germany

Middlware for digital TV (NVoD, IPPV).

Multi-user, multiprocessing virtual memory-based operating system (OS) designed for use in time-sharing, batch processing, and transaction processing.

DEC, USA

First OpenVMS AXP (Alpha) specific version.

Open source project for embedded operating system based on Linux, primarily used on embedded devices to route network traffic.

Defunct embedded operating system for the Sharp Zaurus personal mobile tool PDA.

Sharp, Japan

Mobile operating system running on the Linux kernel. It is based on technologies initially developed by Android Inc.

Open source, FreeBSD-based firewall and routing software developed by Deciso, a company in the Netherlands that makes hardware and sells support packages for OPNsense.

Deciso, Netherlands

Multi task operating system for Computer Automation's NAKED computers.

USA

Linux distribution packaged and freely distributed by Oracle. Uses a version-naming convention identical to that of Red Hat Enterprise Linux.

Oracle, USA

Last version.

Lightweight Operating System. Designed to fit on a floppy.

Timesharing monitor.

Stanford University, USA

Proprietary operating system developed for the express purpose of running AT&T's large-scale PBX switching equipment.

Bell Labs, USA

Operating system for ES EVM.

Russia

Simple single-user operating system.

Oxford University, UK

The only “official” OS for the BK-0010/11 computers, supported by the manufacturer, and included in the delivery of the computer.

Russia

Soviet RT-11 clone.

Russia

Operating system for ES EVM. Comparable to S/360.

Russia

Added RIAD-2 and RIAD-3 computers support.

Operating system for the BESM-6 computer.

IPM, Russia

Soviet operating system for the SM-1810 computer.

Russia

RSX-11M-like multiprogramming operating system. The command are in english.

Russia

See MacOS.

Apple, USA

Formerly MICRODOS. Fast extendable BASIC-language disk operating system.

Percom, USA

Double-density Model III version.

Double-density Model I version for the Percom Doubler.

Family of real-time, process-based, multitasking, multi-user operating systems.

Microware Systems, USA

Unix-like RTO.

Unix-like RTOS. (OS from Microware for Intel x86 based microcomputers; based on OS-9, written in C).

Microware Systems, USA

Operating system for the V-7000 series of 32-bit-architecture multipurpose computers.

Toshiba, Japan

Operating System for UNIVAC 1106 and 1110.

Sperry Univac, USA

Series of computer operating systems, initially created by Microsoft and IBM under the leadership of IBM software designer Ed Iacobucci.

IBM, Microsoft, USA

First i386 32-bit based version.

Ported to PPC via Workplace OS.

Operating System for the MDS Series 21.

Mohawk, USA

Operating system for Honeywell Series 200 family.

USA

Real time serial and multitasking operating systems for Interdata (later Perkin-Elmer) 7/16 and 7/32 minicomputers.

USA

Real time serial and multitasking operating systems for Interdata (later Perkin-Elmer) 7/16 and 7/32 minicomputers.

USA

First official OS targeted for the System/360 architecture.

IBM, USA

Multiprogramming with a Variable number of Tasks. Level of OS/360.

IBM, USA

Upgrade from MVS, with an additional Unix environment.

IBM, USA

Operating Systems for UNIVAC 9700.

USA

Descendant of System/38 CPF, include System/36 SSP environment.

IBM, USA

Operating Systems for UNIVAC 9700.

USA

Realtime multiprogramming OS for Honeywell System 700.

USA

Primary operating system used on the Digital Equipment Corporation's PDP-8 minicomputer. Ancestor of RT-11.

DEC, USA

Early OSE version for the Zilog Z80 processor.

ENEA, Sweden

Operating system for the Soviet personal computers BK-0010.

Russia

Small, open-source, Unix-like OS. Designed to preform networking tasks and other file-oriented processes whiltaking up very little of the computer's processing power.

Multiprogramming with a Fixed number of Tasks. Simple version of OS/MVT suitable for processors with limited memory.

IBM, USA

IBM, USA

Multiple Virtual Space. Virtual storage OS for IBM 370, derived from MVT. Originally called VS2, Release 2.

IBM, USA

Multiprogramming with a Variable Number of Tasks. Popular OS for IBM 360/370.

IBM, USA

Primary Control Program. Early batch-serial version of IBM OS/360.

IBM, USA

Real-time OS kernel for a variety of CPUs.

Destek Group, USA

Single Virtual Space. Initial release of OS/VS2. Virtual Storage OS for IBM S/370, based closely on OS/MVT.

IBM, USA

Port of OS/360 targeted for the System/370 virtual memory architecture, "OS/370" is not correct name for OS/VS1 and OS/VS2, but rather refers to OS/VS2 MVS and MVS/SP Version 1.

IBM, USA

Operating System/Virtual Storage 1, Virtual-memory version of MFT II.

Operating System/Virtual Storage 2, Virtual-memory version of OS/MVT but without multiprocessing support.

Called Multiple Virtual Storage, MVS, eliminated most need for VS1.

Drum memory operating systems for office computers.

NEC, Japan

Instructional OS produced for an undergraduate introductory operating system concepts at Harvard, by the same group of VINO. Mainly inspired to BSD Unix.

Harvard University, USA

Real-time kernel.

STMicrosystems, Canada

Operating system for Honeywell 200/2000.

USA

See Baget RTOS.

Russian Academy of Sciences, Russia

Real-time kernel.

STMicrosystems, Canada

Floppy disk operating systems for office computers.

NEC, Japan

Oregon State Open Shop OS. A timesharing system for the CDC 3300.

USA

Disk operating systems for office computers.

NEC, Japan

Operating system introduced as the successor to GEC DOS, for its range of GEC 4000 series 16-bit, and later 32-bit, minicomputers.

GEC Computers, UK

Large-scale software system that supported a virtual space and multiple processors.

Hitachi, Japan

Cooperative multitasking real-time operating system for Microchip PIC-controllers.

Russia

BS2000 ported to an emulation on a Sun SPARC platform.

Fujitsu-Siemens, Japan

Operating System Embedded (known by the acronym Enea OSE). Real-time embedded operating system.

ENEA, Sweden

Offene Systeme und deren Schnittstellen für die Elektronik in Kraftfahrzeugen. Standards body that has produced specifications for an embedded operating system, a communications stack, and a network management protocol for automotive embedded systems

Germany

Developed into a commercial offering by DEC.

DEC, USA

Free Open Source software operating system development project, aiming to replace eventually all OS/2 subsystems with Open source analogues.

Operating system for Fujitsu’s large-scale general-purpose computers FACOM 230-45S and FACOM 230-55.

Fujitsu, Japan

Successor OS to medium-scale general-purpose OS OSIV/ESP V2. medium-scale general-purpose operating system.

Fujitsu, Japan

One of the operating systems for Fujitsu’s FACOM M series general-purpose computers, and was a medium-scale general-purpose OS for medium-scale business operations.

Fujitsu, Japan

One of the operating systems for Fujitsu’s FACOM M series general-purpose computers, and was a super-large general-purpose OS.

Fujitsu, Japan

Super-large general-purpose operating system.

Fujitsu, Japan

1995 Enhanced version of its OSIV/MSP operating system for Fujitsu very-large mainframes.

1997 Enhanced version of its OSIV/MSP operating system for Fujitsu very-large mainframes.

One of the operating systems for Fujitsu’s FACOM M series general-purpose computers, and was a large general-purpose OS positioned between super-large general-purpose OS OSIV/F4 and medium general-purpose OS OSIV/F2.

Fujitsu, Japan

Successor operating system to Fujitsu’s two OSs: medium-scale general-purpose OS OSIV/ESPIII, and large-scale general-purpose OS OSIV/X8 FSP.

Fujitsu, Japan

Complete modular infrastructure that provides all the "bricks" (resources) needed to easily build an OS, focusing on what interests you, and reusing components for the rest.

University of Utah, USA

A Micro Kernel Operating System written from scratch.

Cloud computing focused computer operating system. It is a special-purpose operating system built to run as a guest on top of a virtual machine, thus it does not include drivers for bare-metal hardware.

Cloudius Systems, Israel

Operating System for Pyramid Computers. Supports UNIX System V and BSD 4.2 concurrently.

USA

Object-oriented OS primarily based on VMS with the use of the GNU toolchain, and Unix-style pipes (also using record-oriented pipes, a VMS feature called a "mailbox").

Ozone Enterprises, USA

Operating System for the MDS Series 21.

USA