everything: operating systems

OPERATING SYSTEMS

operating systems is defined as the interface between the user and hardware or the application and the hardware.To define operating system is a very easy thing but to design and build it is a very difficult task

There are different operating systems at present. They are

Acorn Computers

ARX
Arthur
MOS
RISC OS
RISC iX
PELADANG OS

Amiga Inc.

AmigaOS
- AmigaOS 1.0-3.9 (Motorola 68000)
- AmigaOS 4 (PowerPC)
Amiga Unix (aka Amix)

Apple Inc.

Apple II family
- Apple DOS
- Apple Pascal
- ProDOS
- GS/OS
Apple III
- Apple SOS
Apple Lisa
- Lisa Workshop^[1]
- Lisa Operating System^[2]
Apple Macintosh
- Mac OS
- A/UX (UNIX System V with BSD extensions)
- Rhapsody
- NeXTSTEP
- OS X (formerly Mac OS X)
- OS X Server (formerly Mac OS X Server)
- OS X Mavericks
Apple Network Server
- IBM AIX (Apple-customized)
Apple Newton
- Newton OS
iPhone, iPod Touch, iPad
- iOS
Embedded operating systems
- A/ROSE
- Unnamed embedded OS for iPod
- Unnamed NetBSD variant for Airport Extreme and Time Capsule

Apollo Computer

Domain/OS : One of the first network-based systems. Run on Apollo/Domain hardware. Later bought by Hewlett-Packard.

Atari

Atari DOS (for 8-bit computers)
Atari TOS
Atari MultiTOS

BAE Systems

XTS-400

Be Inc.

BeOS
- BeIA
- BeOS r5.1d0
  - magnussoft ZETA (based on BeOS r5.1d0 source code, developed by yellowTAB)

Bell Labs

Unics ("Ken's new system," for its creator (Ken Thompson), officially Unics and then Unix, the prototypic operating system created in Bell Labs in 1969 that formed the basis for the Unix familyof operating systems)
- UNIX Time-Sharing System v1
- UNIX Time-Sharing System v2
- UNIX Time-Sharing System v3
- UNIX Time-Sharing System v4
- UNIX Time-Sharing System v5
- UNIX Time-Sharing System v6
  - MINI-UNIX
  - PWB/UNIX
    - USG
      - CB Unix
- UNIX Time-Sharing System v7 (It is from Version 7 Unix (and, to an extent, its descendants listed below) that almost all Unix-based and Unix-like operating systems descend.)
  - Unix System III
  - Unix System IV
  - Unix System V
    - Unix System V Releases 2.0, 3.0, 3.2, 4.0, and 4.2
- UNIX Time-Sharing System v8
- UNIX TIme-Sharing System v9
- UNIX Time-Sharing System v10

Non-Unix Operating Systems:

BESYS
Plan 9 from Bell Labs

Bull SAS

GCOS

Burroughs Corporation

Burroughs MCP

Control Data Corporation

Chippewa Operating System (COS)
- SIPROS (for Simultaneous Processing Operating System)
- SCOPE (Supervisory Control Of Program Execution)
- MACE (Mansfield and Cahlander Executive)
  - Kronos (Kronographic OS)
    - NOS (Network Operating System)
      - NOS/BE NOS Batch Environment
EP/IX (Enhanced Performance Unix)

Convergent Technologies

Convergent Technologies Operating System (later acquired by Unisys)

Data General

RDOS Real-time Disk Operating System, with variants: RTOS and DOS (not related to PC DOS, MS-DOS etc.)
AOS for 16-bit Data General Eclipse computers and AOS/VS for 32-bit (MV series) Eclipses, MP/AOS for microNOVA-based computers
DG/UX

DataPoint

CTOS Z-80 based, Cassette Tape Operating System for early desktop systems. Capable of up to 8 simultaneous users. Replaced by DataPoint DOS.
DOS Intel 808x/80x86-based, Disk Operating Systems for desktop systems. Capable of up to 32 users per node. Supported a sophisticated network of nodes that were often purpose-built. The name DOS was used in these products login screens before it was popularized by IBM, Microsoft and others.

DDC-I, Inc.

Deos Time & Space Partitioned RTOS, Certified to DO-178B, Level A since 1998
HeartOS Posix-based Hard Real-Time Operating System

Digital Research, Inc.

CP/M CP/M for Intel 8080/8085 and Zilog Z80
- Personal CP/M, a refinement of CP/M 2.2 with BDOS 2.8
- CP/M Plus with BDOS 3.0
CP/M-68K CP/M for Motorola 68000
CP/M-8000 CP/M for Zilog Z8000
CP/M-86 CP/M for Intel 8088/8086
- CP/M-86 Plus
- Personal CP/M-86
MP/M Multi-user version of CP/M-80
- MP/M II
MP/M-86 Multi-user version of CP/M-86
- MP/M 8-16, a dual-processor variant of MP/M for 8086 and 8080 CPUs.
Concurrent CP/M, the successor of CP/M-80 and MP/M-80
Concurrent CP/M-86, the successor of CP/M-86 and MP/M-86
- Concurrent CP/M 8-16, a dual-processor variant of Concurrent CP/M for 8086 and 8080 CPUs.
Concurrent CP/M-68K, a variant for the 68000
Concurrent DOS, the successor of Concurrent CP/M-86 with PC-MODE
- Concurrent PC DOS, a Concurrent DOS variant for IBM compatible PCs
- Concurrent DOS 8-16, a dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs.
- Concurrent DOS 286
- Concurrent DOS XM, a real-mode variant of Concurrent DOS with EEMS support
- Concurrent DOS 386
  - Concurrent DOS 386/MGE, a Concurrent DOS 386 variant with advanced graphics terminal capabilities
Concurrent DOS 68K, a port of Concurrent DOS to Motorola 68000 CPUs with DOS source code portability capabilities
FlexOS 1.0 - 2.34, a derivative of Concurrent DOS 286
- FlexOS 186, a variant of FlexOS for terminals
- FlexOS 286, a variant of FlexOS for hosts
  - Siemens S5-DOS/MT, an industrial control system based on FlexOS
  - IBM 4680 OS, a POS operating system based on FlexOS
  - IBM 4690 OS, a POS operating system based on FlexOS
- FlexOS 386, a later variant of FlexOS for hosts
  - IBM 4690 OS, a POS operating system based on FlexOS
- FlexOS 68K, a derivative of Concurrent DOS 68K
Multiuser DOS, the successor of Concurrent DOS 386
- CCI Multiuser DOS
- Datapac Multiuser DOS
  - Datapac System Manager, a derivative of Datapac Multiuser DOS
- IMS Multiuser DOS
  - IMS REAL/32, a derivative of Multiuser DOS
    - IMS REAL/NG, the successor of REAL/32
DOS Plus 1.2 - 2.1, a single-user, multi-tasking system derived from Concurrent DOS 4.1 - 5.0
DR DOS 3.31 - 6.0, a single-user, single-tasking native DOS derived from Concurrent DOS 6.0
- Novell PalmDOS 1.0
- Novell "Star Trek"
- Novell DOS 7, a single-user, multi-tasking system derived from DR DOS
- Caldera OpenDOS 7.01
- Caldera DR-DOS 7.02 and higher

Digital/Tandem Computers/Compaq/HP

OS/8
Multi-Programming Executive (from HP)
TOPS-10 (for the PDP-10)
WAITS (for the PDP-6 and PDP-10)
TENEX (from BBN, for the PDP-10)
TOPS-20 (for the PDP-10)
RSTS/E (multi-user time-sharing OS for PDP-11s)
RSX-11 (multiuser, multitasking OS for PDP-11s)
RT-11 (single user OS for PDP-11)
VMS (originally by DEC, now by HP) for the VAX mini-computer range, Alpha and Intel Itanium 2; later renamed OpenVMS)
Domain/OS (originally Aegis, from Apollo Computer who were bought by HP)
Digital UNIX (derived from OSF/1, became HP's Tru64 UNIX)
HP-UX
Ultrix
NonStop

ENEA AB

OSE Flexible, small footprint, high-performance RTOS for control processors

Fujitsu

Towns OS

Google

Android 4.0.1 on the Galaxy Nexus

Google Chrome OS is designed to work exclusively with web applications. Announced on July 7, 2009, Chrome OS is currently publicly available and was released summer 2011. The Chrome OS source code was released on November 19, 2009 under the BSD license as Chromium OS.
- Chromium OS is an open source operating system development version of Google Chrome OS. Both operating systems are based on the Linux kernel.
Android is an operating system for mobile devices. Android is based on Linux core.
es is a computer operating system developed originally by Nintendo and since 2008 by Google. It is open source and runs natively on x86 platforms.

Green Hills Software

INTEGRITY Reliable Operating system
INTEGRITY-178B A DO-178B certified version of INTEGRITY.
µ-velOSity A lightweight microkernel.

Heathkit/Zenith Data Systems

HDOS; ran on the H8 and Heath/Zenith Z-89 series
HT-11 (a modified version of RT-11) ran on the Heathkit H11

Hewlett-Packard

HP Multi-Programming Executive; (MPE, MPE/XL, and MPE/iX) runs on HP 3000 and HP e3000 mini-computers.
HP-UX; runs on HP9000 and Itanium servers - from small to mainframe-class computers.

Honeywell

Multics
GCOS

Intel Corporation

iRMX; real-time operating system originally created to support the Intel 8080 and 8086 processor families in embedded applications.
ISIS-II; "Intel Systems Implementation Supervisor" was THE environment for development of software within the Intel microprocessor family in the early 1980s on their Intellec Microcomputer Development System and clones. ISIS-II worked with 8 inch floppy disks and had an editor, cross-assemblers, a linker, an object locator, debugger, compilers for PLM (PL/I for microprocessors of the 8080/86 family), a BASIC interpreter, etc. and allowed file management through a console.

IBM

On early IBM mainframes (1400, 1800, 701, 704, 709, 7090, and 7094)

BESYS (for the IBM 7090)
CTSS (The Compatible Time-Sharing System, developed at MIT's Computation Center for use on a modified IBM 7094)
GM OS & GM-NAA I/O (for the IBM 704)
IBSYS (tape based operating system for IBM 7090 and IBM 7094)
IJMON (A bootable serial I/O monitor for loading programs for IBM 1400 and IBM 1800)
SOS (SHARE Operating System, for the IBM 704 and 709)
UMES (University of Michigan Executive System, for the IBM 704, 709, and 7090)

On IBM S/360, S/370, and successor mainframes[edit]

OS/360 and successors on IBM S/360, S/370, and successor mainframes
- OS/360 (first official OS targeted for the System/360 architecture),
  Saw customer installations of the following variations:
  - PCP (Primary Control Program, a kernel and a ground breaking automatic space allocating file system)
  - MFT (original Multi-programming with a Fixed number of Tasks, replaced by MFT II)
  - MFT II (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)
  - MVT (Multi-Programming Variable Tasks, had up to 15 application regions defined dynamically, plus additional regions for system tasks)
- OS/VS (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),
  Customer installations in the following variations:
  - SVS (Single Virtual Storage, both VS1 & VS2 began as SVS systems)
  - OS/VS1 (Operating System/Virtual Storage 1, Virtual-memory version of MFT II)
  - OS/VS2 (Operating System/Virtual Storage 2, Virtual-memory version of OS/MVT but without multiprocessing support)
    - OS/VS2 R2 (called Multiple Virtual Storage, MVS, eliminated most need for VS1)
- MVS/SE (MVS System Extensions)
- MVS/SP (MVS System Product)
- MVS/XA (MVS/SP V2. MVS supported eXtended Architecture, 31-bit addressing)
- MVS/ESA (MVS supported Enterprise System Architecture, horizontal addressing extensions: data only address spaces called Dataspaces; a Unix environment was available starting with MVS/ESA V4R3)
- OS/390 (Upgrade from MVS, with an additional Unix environment)
- z/OS (OS/390 supported z/Architecture, 64-bit addressing)
DOS/360 and successors on IBM S/360, S/370, and successor mainframes
- BOS/360 (early interim version of DOS/360, briefly available at a few Alpha & Beta System/360 sites)
- TOS/360 (similar to BOS above and more fleeting, able to boot and run from 2x00 series tape drives)
- DOS/360 (Disk Operating System (DOS), multi-programming system with up to 3 partitions, first commonly available OS for System/360)
  - DOS/360/RJE (DOS/360 with a control program extension that provided for the monitoring of remote job entry hardware (card reader & printer) connected by dedicated phone lines)
- DOS/VS (First DOS offered on System/370 systems, provided virtual storage)
- DOS/VSE (also known as VSE, upgrade of DOS/VS, up to 14 fixed size processing partitions )
- VSE/SP (program product replacing DOS/VSE and VSE/AF)
- VSE/ESA (DOS/VSE extended virtual memory support to 32-bit addresses (Extended System Architecture)).
- z/VSE (latest version of the four decades old DOS lineage, supports 64-bit addresses, multiprocessing, multiprogramming, SNA, TCP/IP, and some virtual machine features in support of Linux workloads)
CP/CMS (Control Program/Cambridge Monitor System) and successors on IBM S/360, S/370, and successor mainframes
- CP-40/CMS (for System/360 Model 40)
- CP-67/CMS (for System/360 Model 67)
- VM/370 (Virtual Machine / Conversational Monitor System, virtual memory operating system for System/370)
- VM/XA (VM/eXtended Architecture for System/370 with extended virtual memory)
- VM/ESA (Virtual Machine / Extended System Architecture, added 31-bit addressing to VM series)
- z/VM (z/Architecture version of the VM OS with 64-bit addressing)

Further information: History of CP/CMS

TPF Line (Transaction Processing Facility) on IBM S/360, S/370, and successor mainframes (largely used by airlines)
- ACP (Airline Control Program)
- TPF (Transaction Processing Facility)
- z/TPF (z/Architecture extension)
Unix-like on IBM S/360, S/370, and successor mainframes
- AIX/370 (IBM's Advanced Interactive eXecutive, a System V Unix version)
- AIX/ESA (IBM's Advanced Interactive eXecutive, a System V Unix version)
- OpenSolaris for IBM System z
- UTS (developed by Amdahl)
- z/Linux
Others on IBM S/360, S/370, and successor mainframes:
- BOS/360 (Basic Operating System)
- MTS (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)
- RTOS/360 (IBM's Real Time Operating System, ran on 5 NASA custom System/360-75s)
- TOS/360 (Tape Operating System)
- TSS/360 (IBM's Time Sharing System)
- MUSIC/SP (developed by McGill University for IBM System/370)
- ORVYL and WYLBUR (developed by Stanford University for IBM System/360)

On IBM PC and Intel x86 based architectures[edit]

PC DOS / IBM DOS
- PC DOS 1.x, 2.x, 3.x (developed jointly with Microsoft)
- IBM DOS 4.x, 5.0 (developed jointly with Microsoft)
- PC DOS 6.1, 6.3, 7, 2000, 7.10

OS/2
- OS/2 1.x (developed jointly with Microsoft)
- OS/2 2.x
- OS/2 Warp 3
- OS/2 Warp 4
- eComStation (Warp 4.5/Workspace on Demand, rebundled by Serenity Systems International)
4680 OS version 1 to 4, a POS operating system based on Digital Research's Concurrent DOS 286 and FlexOS 286 1.xx
- 4690 OS version 1 to 6.2, a successor to 4680 OS based on Novell's FlexOS 286/FlexOS 386 2.3x

On other IBM hardware platforms

IBM Series/1
- EDX (Event Driven Executive)
- RPS (Realtime Programming System)
- CPS (Control Programming Support, subset of RPS)
- SerIX (Unix on Series/1)
IBM 1130
- DMS (Disk Monitor System)
IBM 1800
- TSX (Time Sharing eXecutive)
- MPX (Multi Programming eXecutive)
IBM 8100
- DPCX (Distributed Processing Control eXecutive)
- DPPX (Distributed Processing Programming Executive)
IBM System/3
- DMS (Disk Management System)
IBM System/34, IBM System/36
- SSP (System Support Program)
IBM System/38
- CPF (Control Program Facility)
IBM System/88
- Stratus VOS (developed by Stratus, and used for IBM System/88, Original equipment manufacturer from Stratus)
AS/400, iSeries, System i, Power Systems i Edition
- OS/400 (descendant of System/38 CPF, include System/36 SSP environment)
- i5/OS (extends OS/400 with significant interoperability features)
- IBM i (extends i5/OS)
UNIX on IBM POWER
- AIX (Advanced Interactive eXecutive, a System V Unix version)
- AOS (a BSD Unix version, not related to Data General AOS)
Others
- IBM Workplace OS (Microkernel based operating system, developed and canceled in 1990s)
- K42 (open-source research operating system on PowerPC or x86 based cache-coherent multiprocessor systems)
- Dynix (developed by Sequent, and used for IBM NUMA-Q too)

International Computers Limited

J and MultiJob for the System 4 series mainframes
GEORGE 2/3/4 GEneral ORGanisational Environment, used by ICL 1900 series mainframes
Executive, used on the 290x range of minicomputers
TME, used on the ME29 minicomputer
ICL VME, including early variants VME/B and VME/2900, appearing on the ICL 2900 Series and Series 39 mainframes, implemented in S3
VME/K on early smaller 2900s

LynuxWorks (originally Lynx Real-time Systems)

LynxOS

Micrium Inc.

MicroC/OS-II (Small pre-emptive priority based multi-tasking kernel)
MicroC/OS-III (Small pre-emptive priority based multi-tasking kernel, with unlimited number of tasks and priorities, and round robin scheduling)

Microsoft Corporation

Xenix (licensed version of Unix; licensed to SCO in 1987)
MSX-DOS (developed by MS Japan for the MSX 8-bit computer)
MS-DOS (developed jointly with IBM, versions 1.0–6.22)
Windows (16-bit and 32-bit preemptive and cooperative multitasking)
- Windows 1.0 (Windows 1)
- Windows 2.0 (Windows 2 - separate version for i386 processor)
- Windows 3.0 (Windows 3)
- Windows 3.1x (Windows 3.1)
- Windows for Workgroups 3.1 (Codename Snowball)
- Windows 3.2 (Chinese-only release)
- Windows for Workgroups 3.11
- Windows 95 (Codename Chicago - Windows 4.0)
- Windows 98 (Codename Memphis - Windows 4.1)
- Windows Millennium Edition (Windows Me - Windows 4.9)
Windows NT (Full 32-bit or 64-bit kernel, not dependent on MS-DOS)
- Windows NT 3.1
- Windows NT 3.5
- Windows NT 3.51
- Windows NT 4.0
- Windows 2000 (Windows NT 5.0)
- Windows XP (Windows NT 5.1)
- Windows Server 2003 (Windows NT 5.2)
- Windows Fundamentals for Legacy PCs (based on Windows XP)
- Windows Vista (Windows NT 6.0)
- Windows Azure (Cloud OS Platform) 2009
- Windows Home Server (based on Windows Server 2003)
- Windows Server 2008 (based on Windows Vista)
- Windows 7 (Windows NT 6.1)
- Windows Server 2008 R2 (based on Windows 7)
- Windows Home Server 2011 (based on Windows Server 2008 R2)
- Windows Server 2012 (based on Windows 8)
- Windows 8 (Windows NT 6.2)
- Windows Phone 8
- Windows 8.1 (based on Windows 8)
- Windows Server 2012 R2 (based on Windows 8.1)
Windows CE (OS for handhelds, embedded devices, and real-time applications that is similar to other versions of Windows)
- Windows CE 3.0
- Windows CE 5.0
- Windows CE 6.0
- Windows Mobile (based on Windows CE, but for a smaller form factor)
- Windows Phone 7
- Windows Phone 8
Singularity - A research operating system written mostly in managed code (C#)
Midori - A managed code operating system
Xbox 360 system software

MontaVista Software

MontaVista Mobilinux

NCR Corporation

TMX - Transaction Management eXecutive

Novell

NetWare network operating system providing high-performance network services. Has been superseded by Open Enterprise Server line, which can be based on NetWare or Linux to provide the same set of services.
Open Enterprise Server, the successor to NetWare.

Quadros Systems

RTXC Quadros RTOS proprietary C-based RTOS used in embedded systems ows

RCA

TSOS, first OS supporting virtual addressing of the main storage and support for both timeshare and batch interface

RoweBots

DSPnano RTOS 8/16 Bit Ultra Tiny Embedded Linux Compatible RTOS

Samsung Electronics

SCO / The SCO Group

Xenix, Unix System III based distribution for the Intel 8086/8088 architecture
- Xenix 286, Unix System V Release 2 based distribution for the Intel 80286 architecture
- Xenix 386, Unix System V Release 2 based distribution for the Intel 80386 architecture
SCO Unix, SCO UNIX System V/386 was the first volume commercial product licensed by AT&T to use the UNIX System trademark (1989). Derived from AT&T System V Release 3.2 with an infusion of Xenix device drivers and utilities plus most of the SVR4 features
- SCO Open Desktop, the first 32-bit graphical user interface for UNIX Systems running on Intel processor-based computers. Based on SCO Unix
SCO OpenServer 5, AT&T UNIX System V Release 3 based
SCO OpenServer 6, SVR5 (UnixWare 7) based kernel with SCO OpenServer 5 application and binary compatibility, system administration, and user environments
UnixWare
- UnixWare 2.x, based on AT&T System V Release 4.2MP
- UnixWare 7, UnixWare 2 kernel plus parts of 3.2v5 (UnixWare 2 + OpenServer 5 = UnixWare 7). Referred to by SCO as SVR5

Scientific Data Systems (SDS)

Berkeley Timesharing System for the SDS 940

SYSGO

PikeOS is a certified real time operating system for safety and security critical embedded systems

TRON Project

TRON (open real-time operating system kernel)
T-Kernel

Unisys

Unisys OS 2200 operating system

UNIVAC (later Unisys)

EXEC I
EXEC II
EXEC 8 Ran on 1100 series.
VS/9, successor to RCA TSOS

Wang Laboratories

WPS Wang Word Processing System. Micro-code based system.
OIS Wang Office Information System. Successor to the WPS. Combined the WPS and VP/MVP systems.

Wind River Systems

VxWorks Small footprint, scalable, high-performance RTOS

Other

Lisp-based

Symbolics Genera written in a systems dialect of the Lisp programming language called ZetaLisp and Symbolics Common Lisp. Genera was ported to a virtual machine for the DEC Alpha line of computers.
Texas Instruments' Explorer Lisp machine workstations also had systems code written in Lisp Machine Lisp.
The Xerox 1100 series of Lisp machines ran an operating system written in Interlisp that was also ported to virtual machine called "Medley."
Lisp Machines, Inc. also known as LMI, also ran an operating system based on MIT's Lisp Machine Lisp.

Non-standard language-based

The Mesa programming language was used to implement the Pilot operating system, used in Xerox Star workstations.
PERQ Operating System (POS) was written in PERQ Pascal.

Other proprietary non-Unix-like

Эльбрус-1 (Elbrus-1) and Эльбрус-2 used for application, job control, system programming,^[4] implemented in uЭль-76 (AL-76).
EOS; developed by ETA Systems for use in their ETA-10 line of supercomputers
EMBOS; developed by Elxsi for use on their mini-supercomputers
GCOS is a proprietary Operating System originally developed by General Electric
PC-MOS/386; DOS-like, but multiuser/multitasking
SINTRAN III; an operating system used with Norsk Data computers.
THEOS
TRS-DOS; A floppy-disk-oriented OS supplied by Tandy/Radio Shack for their Z80-based line of personal computers.
NewDos/80; A third-party OS for Tandy's TRS-80 personal computers.
TX990/TXDS, DX10 and DNOS; proprietary operating systems for TI-990 minicomputers
MAI Basic Four; An OS implementing Business Basic from MAI Systems.
Michigan Terminal System; Developed by a group of universities in the US, Canada, and the UK for use on the IBM System/360 Model 67, the System/370 series, and compatible mainframes
MUSIC/SP; an operating system developed for the S/370, running normally under VM
SkyOS; commercial desktop OS for PCs
TSX-32; a 32-bit operating system for x86 platform.
OS ES; an operating system for ES EVM
Prolog-Dispatcher; used to control Soviet Buran space ship.

Other proprietary Unix-like and POSIX-compliant

Aegis (Apollo Computer)
Amiga Unix (Amiga ports of Unix System V release 3.2 with Amiga A2500UX and SVR4 with Amiga A3000UX. Started in 1990, last version was in 1992)
Coherent (Unix-like OS from Mark Williams Co. for PC class computers)
DC/OSx (DataCenter/OSx was an operating system for MIPS based systems developed by Pyramid Technology)
DG/UX (Data General Corp)
DNIX from DIAB
DSPnano RTOS (POSIX nanokernel, DSP Optimized, Open Source)
HeliOS developed and sold by Perihelion Software mainly for transputer based systems
Interactive Unix (a port of the UNIX System V operating system for Intel x86 by Interactive Systems Corporation)
IRIX from SGI
MeikOS
NeXTSTEP (developed by NeXT; a Unix-based OS based on the Mach microkernel)
OS-9 Unix-like RTOS. (OS from Microware for Motorola 6809 based microcomputers)
OS9/68K Unix-like RTOS. (OS from Microware for Motorola 680x0 based microcomputers; based on OS-9)
OS-9000 Unix-like RTOS. (OS from Microware for Intel x86 based microcomputers; based on OS-9, written in C)
OSF/1 (developed into a commercial offering by Digital Equipment Corporation)
OpenStep
QNX (POSIX, microkernel OS; usually a real time embedded OS)
Rhapsody (an early form of Mac OS X)
RISC iX - Derived from BSD 4.3, by Acorn computers, for their ARM family of machines.
RISC/os (a port by MIPS of 4.3BSD to the RISC MIPS architecture)
RMX
SCO UNIX (from SCO, bought by Caldera who renamed themselves SCO Group)
SINIX (a port by SNI of Unix to the RISC MIPS architecture)
Solaris (Sun's System V-based replacement for SunOS)
SunOS (BSD-based Unix system used on early Sun hardware)
SUPER-UX (a port of System V Release 4.2MP with features adopted from BSD and Linux for NEC SX architecture supercomputers)
System V (a release of AT&T Unix, 'SVR4' was the 4th minor release)
System V/AT, 386 (The first version of AT&T System V UNIX on the IBM 286 and 386 PCs, ported and sold by Microport)
Trusted Solaris (Solaris with kernel and other enhancements to support multilevel security)
UniFLEX (Unix-like OS from TSC for DMA-capable, extended addresses, Motorola 6809 based computers; e.g. SWTPC, GIMIX, …)
Unicos (the version of Unix designed for Cray Supercomputers, mainly geared to vector calculations)
UTX-32 (Developed by Gould CSD (Computer System Division), a Unix-based OS that included both BSD and System V characteristics. It was one of the first Unix based systems to receive NSA's C2 security level certification.)

Non-proprietary

Unix-like

Research Unix-like and other POSIX-compliant

Minix (study OS developed by Andrew S. Tanenbaum in the Netherlands)
Plan 9 (distributed OS developed at Bell Labs, based on original Unix design principles yet functionally different and going much further)
- Inferno (distributed OS derived from Plan 9, originally from Bell Labs)
- Plan B (distributed OS derived from Plan 9 and Off++ microkernel)
Unix (OS developed at Bell Labs ca 1970 initially by Ken Thompson)
Xinu (Study OS developed by Douglas E. Comer in the USA)

Free and open source Unix-like

Ubuntu, an example of a Unix-like system

BSD (Berkeley Software Distribution, a variant of Unix for DEC VAX hardware)
- FreeBSD (one of the outgrowths of UC Regents' abandonment of CSRG's 'BSD Unix')
  - DragonFlyBSD forked from FreeBSD 4.8
  - Darwin
  - GhostBSD
  - PC-BSD
- NetBSD (An embeded device BSD variant)
  - OpenBSD forked from NetBSD
Hurd
Linux

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Monday, February 17, 2014

operating systems