Table of contents

1 List of operating systems 1.1 Early, and historically important 1.2 Early, proprietary microcomputer OS 1.3 Unix-like and other POSIX-compliant systems 1.4 Generic/commodity, non-UNIX, and other 2 Proprietary 2.4.1 Acorn 2.4.2 Amiga 2.4.3 Atari ST 2.4.4 Apple/Macintosh 2.4.5 Be Incorporated 2.4.6 Digital/Compaq/HP 2.4.7 IBM 2.4.8 Microsoft 2.5 Personal digital assistants (PDAs) 2.6 Microcontroller, embedded 2.7 Uncategorized 3 See also

List of operating systems

Early, and historically important

• CTSS (The Compatible TimeShare System, developed at MIT by Corbato, et al)
• THE operating system (by Dijkstra et al)
• Multics (joint OS development project by Bell Labs, GE, and MIT)

• Apple Computer (inital version was ROM'd firmware together with Integer BASIC; later versions included a Microsoft BASIC)
• Business Operating System (BOS) - cross platform, command-line based
• Commodore PET, Commodore 64, and Commodore VIC-20,
• The very first IBM-PC (3 OS offered to start, UCSD_P-system, CPM-86, PC-DOS)
• Sinclair Micro and QX, etc
• TRS-DOS, ROM OS's (largely Microsoft BASIC implementations with file system extensions)
• TI99-4
• Flex (by Technical Systems Consultants for Motorola 6800 based microcomputers: SWTPC, Tano, Smoke Signal Broadcasting, Gimix, etc)
• FLEX9 (by TSC for Motorola 6809 based micros)
• mini-FLEX (by TSC for 5.25" disks on 6800 based machines)

• AIX (Unix from IBM)
• Amoeba (research OS by Andrew S. Tanenbaum)
• AtheOS (continued under the Syllable code-fork)
• A/UX (Unix-based Apple OS from the beginning of the 1990s)
• BSD (Berkeley Software Distribution, a variant of Unix for DEC VAX hardware)
• Cromix (Unix-emulating OS from Cromemco)
• Coherent (Unix-emulating OS from Mark Williams Co. for PC class computers)
• DNIX
• Digital UNIX (which became HP's Tru64)
• FreeBSD (one of the open source outgrowths of UC Regents' abandonment of CSRG's 'BSD Unix')
• GNU/Hurd
• GNU/Linux (see Linux)
• HP-UX from HP
• IRIX from SGI
• LainOS (FreeBSD-based project that aims to reproduce the "Navi" GUI from Serial Experiments Lain)
• Linux (major free Unix-like kernel)
• Mac OS X from Apple Computer
• Minix (study OS developed by Andrew S. Tanenbaum in the Netherlands)
• Menuet
• NetBSD (one of the post-CSRG open source varieties of BSD)
• NeXTSTEP
• OS-9(for Morotola 6809 based machines)
• OS-9/68k (for Motorola 680x0 based machines)
• OS-9000 (OS-9 written in C for intel and other processors)
• OS/360
• OSF/1
• OpenBSD (one of the post-CSRG open source varieties of BSD)
• Plan 9 (networking OS developed at Bell Labs)
• QNX (POSIX, microkernel OS; usually a real time embedded OS)
• RiscOS
• SCO UNIX (from SCO, bought by Caldera and re-renamed SCO)
• Solaris from Sun Microsystems
• SunOS from Sun Microsystems (became Solaris)
• System V (a release of AT&T Unix, 'SVr4' was the 4th minor release)
• UNIX (OS developed at Bell Labs ca 1970 initially by Ken Thompson)
• UNIflex (Unix emulating OS by TSC for DMA-capable, extended addresses, Mototola 6809 based computers; eg SWTPC, GIMIX, ...)
• Ultrix (DEC's first version of Unix for VAX and PDP-11, based on BSD)
• UniCOS
• Xenix (Microsoft's licensed version of Unix for various hardware platforms)
• z/OS (latest version of IBM mainframe OS)

• AOS, now called Bluebottle (a concurrent and active object update to the Oberon operating system)
• AROS (Amiga Research Operating System)
• Bluebottle (see AOS)
• Control Program/Monitor-80 (CPM operating system)
• MP/M-80 (Multi programming version of CP/M-86 from Digital Research)
• UCSD P-system (portable complete programming environment/operating system developed by a long running student project at the Univ Calif/San Diego; directed by Prof Ken Bowles; written Pascal)
• FLEX9 (by TSC for Motorola 6809 based machines; successor to FLEX, which was for Motorola 6800 CPUs)
• SSB-DOS (by TSC for Smoke Signal Broadcasting; a variant of FLEX in most respects)
• CP/M-86 (CP/M for Intel 8088/86 from Digital Research)
• DESQView (windowing GUI for MS-DOS, ca 1985)
• DR-DOS (MS-DOS compatible OS from Digital Research, later from Novell, Caldera, ..; still being used for special purpose projects)
• FreeDOS (an open source MS-DOS workalike)
• GEM (GUI for MS-DOS / DR-DOS from Digital Research)
• GEOS
• MS-DOS (Microsoft developed OS for IBM PC compatible machines)
• PC-DOS (IBM's version of DOS for PC machines)
• Mach (from OS kernel research at CMU; see NextStep)
• NewOS
• Oberon operating system/(developed at ETH-Zurich by Niklaus Wirth et al) for the Ceres and Chameleon workstation projects. see also Oberon programming language
• OS/2 (Windows/MS-DOS compatible operating system developed originally at Microsoft and taken over by IBM; a considerable technical improvement on both early Windows and MS-DOS. Not a commercial success. The Odin open source project adds Windows 9x compatibility to OS/2. See Sourceforge.com for details)
• OS-9 (Unix emulating OS from Microware for Motorola 6809 based microcomputers)
• OS-9/68k (Unix emulating OS from Microware for Morotola 680x0 based computers; developed from OS-9)
• OS-9000 (portable Unix emulating OS from Microware; one implementation was for Intel x86)
• ReactOS (an open source Windows NT workalike)
• SkyOS
• TripOS
• TUNES
• QDOS (developed at Seattle Computer Products by Tim Paterson for the new Intel 808x CPUs; also called SCP-DOS; licensed to Microsoft -- became MS-DOS/PC-DOS)
• VisiOn (first GUI for early PC machines, not commercially successful)
• VME by International Computers Limited (ICL)
• MorphOS (by Genesi)
• NetWare (by Novell)
• NeXTStep (which, more or less, became Mac OS X by NeXT)
• Pick (often licensed and renamed)
• Plan 9, Inferno (networked OS originally from Bell Labs Computer Research)
• Primos by Prime Computer
• BS2000 by Siemens AG
• Visopsys

• Arthur
• ARX
• RISC OS
• RISCiX

• AmigaOS

• TOS
• MultiTOS
• MiNT

• Apple DOS
• A/UX
• ProDOS
• GS/OS
• Mac OS
• Mac OS X
• Apple Darwin

• BeOS
• BeIA
• Zeta

• AIS

• OS-8
• ITS (for the PDP-6 and PDP-10)
• TOPS-10 (for the PDP-10)
• WAITS
• TENEX (from BBN)
• TOPS-20 (for the PDP-10)
• RSTS/E (ran on several machines, chiefly PDP-11s)
• RSX-11 (multiuser, multitasking OS for PDP-11s)
• RT-11 (single user OS for PDP-11)
• VMS (by DEC for the VAX mini-computer range; later renamed OpenVMS)

• OS/2
• AIX (a version of Unix)
• OS/400
• OS/390
• VM/CMS
• DOS/VSE
• OS/360 (first OS planned for the System 360 architecture)
• MFT (later called OV/VS1)
• MVT (later called OV/VS2)
• SVS
• MVS (latest variant of MVT)
• TPF
• ALCS
• OS/390
• z/OS
• Basic Operating System (first system released for the System 360, as an interim)
• PC-DOS (aka MS-DOS when purchased via Microsoft)

• MS-DOS
• Microsoft Windows
  • Windows 1.0 (for 80286)
  • Windows 2.0
  • Windows 3.0 the first version to make substantial commercial impact
  • Windows 3.1
  • Windows 95
  • Windows 98 there was a 98 2nd edition as well
  • Windows ME
• Windows NT (developed at Microsoft by a team led by David Cutler)
  • Windows NT 3.5
  • Windows NT 4
  • Windows 2000 (aka Windows NT v5.0)
  • Windows XP (based on Win2K internally, but single user and with disabled capabilities; 2 versions: Home and Professional)
  • Windows Server 2003
• Xenix (licensed version of Unix; sold to SCO in '90s)
• Windows CE (compact edition, for handhelds)

• Palm OS from Palm Inc; now spun off as PalmSource
• Pocket PC from Microsoft
• EPOC originally from Psion (UK), now from Symbian, preferred name now is Symbian OS
• Windows CE Windows Compact Edition, from Microsoft

• OSEK
• Nucleus
• QNX
• VxWorx

• Trion Operating System

• Disk operating system (MS-DOS/PC-DOS, originally called QDOS)
• Real-time operating system
• computer software