Timeline of operating systems

1950s

• 1951
• * LEO I 'Lyons Electronic Office' was the commercial development of EDSAC computing platform, supported by British firm J. Lyons and Co.
• 1953
• * DYSEAC - an early machine capable of distributing computing
• 1955
• * General Motors Operating System made for IBM 701
• * MIT's Tape Director operating system made for UNIVAC 1103
• 1956
• * GM-NAA I/O for IBM 704, based on General Motors Operating System
• 1957
• * Atlas Supervisor
• * BESYS, for IBM 704, later IBM 7090 and IBM 7094
• 1958
• * University of Michigan Executive System, for IBM 704, 709, and 7090
• 1959
• * SHARE Operating System, based on GM-NAA I/O

1960s

• 1960
• * IBSYS
• 1961
• * CTSS demonstration
• * MCP for B5000
• 1962
• * Atlas Supervisor
• * BBN Time-Sharing System
• * GCOS
• 1963
• * ADMIRAL
• * AN/FSQ-32, another early time-sharing system begun
• * CTSS becomes operational
• * JOSS, an interactive time-shared system that did not distinguish between operating system and language
• * Titan Supervisor, early time-sharing system begun
• 1964
• * Berkeley Timesharing System
• * Chippewa Operating System
• * Dartmouth Time-Sharing System
• * EXEC 8
• * KDF9 Timesharing Director – an early, fully hardware secured, fully pre-emptive process switching, multi-programming operating system for KDF9
• * OS/360
• * PDP-6 Monitor descendant renamed TOPS-10 in 1970
• * SCOPE
• 1965
• * BOS/360
• * DECsys
• * TOS/360
• * Livermore Time Sharing System
• * Multics
• * Pick operating system
• * SIPROS 66
• * THE multiprogramming system development
• * TSOS
• 1966
• * DOS/360
• * GEORGE 1 & 2 for ICT 1900 series
• * Mod 1
• * Mod 2
• * Mod 8
• * MS/8
• * MSOS
• * OS/360 PCP and MFT
• * RAX
• * Remote Users of Shared Hardware, a time-sharing system developed by Allen-Babcock for the IBM 360/50
• * SODA for Elwro's Odra 1204
• * Universal Time-Sharing System
• 1967
• * CP-40, predecessor to CP-67 on modified IBM System/360 Model 40
• * CP-67
• * Conversational Programming System, an IBM time-sharing system under OS/360
• * Michigan Terminal System
• * ITS
• * OS/360 MVT
• * ORVYL
• * TSS/360
• * WAITS
• 1968
• * Airline Control Program (ACP)
• * B1
• * CALL/360, an IBM time-sharing system for System/360
• * HP Real-Time Executive – Hewlett-Packard
• * HP Time-Shared BASIC – Hewlett-Packard
• * THE multiprogramming system publication
• * TSS/8
• * VP/CSS
• 1969
• * B2
• * B3
• * GEORGE 3 For ICL 1900 series
• * MINIMOP
• * Multics
• * RC 4000 Multiprogramming System
• * TENEX
• * Unics (later Unix)
• * Xerox Operating System

1970s

• 1970
• * DOS-11
• 1971
• * EMAS
• * Kronos
• * RSTS-11 2A-19
• * RSX-15
• * OS/8
• 1972
• * B4
• * COS-300
• * Data General RDOS
• * Edos
• * MUSIC/SP
• * OS/4
• * OS 1100
• * Operating System/Virtual Storage 1
• * Operating System/Virtual Storage 2 R1
• * PRIMOS
• * Virtual Machine/Basic System Extensions Program Product
• * Virtual Machine/System Extensions Program Product
• * Virtual Machine Facility/370, sometimes known as VM/CMS
• 1973
• * Эльбрус-1 – Soviet computer – created using high-level language uЭль-76
• * Alto OS
• * CP-V
• * RSX-11D
• * RT-11
• * VME – implementation language S3
• 1974
• * ACOS-2
• * ACOS-4
• * ACOS-6
• * CP/M
• * DOS-11 V09-20C
• * Hydra – capability-based, multiprocessing OS kernel
• * MONECS
• * Multi-Programming Executive – Hewlett-Packard
• * Operating System/Virtual Storage 2 R2
• * OS/7
• * OS/16
• * OS/32
• * Sintran III
• 1975
• * BS2000 V2.0
• * COS-350
• * ISIS
• * NOS
• * OS/3
• * VS/9
• * Version 6 Unix
• * XVM/DOS
• * XVM/RSX
• 1976
• * Cambridge CAP computer – all operating system procedures written in ALGOL 68C, with some closely associated protected procedures in BCPL
• * Cray Operating System
• * DX10
• * FLEX
• * TOPS-20
• * TX990/TXDS
• * Tandem Nonstop OS v1
• * Thoth
• 1977
• * 1BSD
• * AMOS
• * KERNAL
• * OASIS operating system
• * OS68
• * OS4000
• * RMX-80
• * System 88 (Exec)
• * System Support Program
• * TRSDOS
• * Virtual Memory System (VMS) V1.0
• * VRX
• * VS Virtual Memory Operating System
• 1978
• * 2BSD
• * Apple DOS
• * Control Program Facility
• * Cray Time Sharing System
• * DPCX
• * DPPX
• * HDOS
• * KSOS – secure OS design from Ford Aerospace
• * KVM/370 – security retro-fit of IBM VM/370
• * Lisp machine
• * MVS/System Extensions
• * OS4
• * PTDOS
• * TRIPOS
• * UCSD p-System
• 1979
• * Atari DOS
• * 3BSD
• * CP-6
• * Idris
• * MP/M
• * MVS/System Extensions R2
• * NLTSS
• * POS
• * Sinclair BASIC
• * Transaction Processing Facility (TPF)
• * UCLA Secure UNIX – an early secure UNIX OS based on security kernel
• * UNIX/32V
• * DOS/VSE
• * Version 7 Unix

1980s

• 1980
• * 86-DOS
• * AOS/VS
• * Business [Operating System (software)|Business Operating System]
• * CTOS
• * MVS/System Product V1
• * NewDos/80
• * OS-9
• * RMX-86
• * RS-DOS
• * SOS
• * Virtual Machine/System Product
• * Xenix
• 1981
• * Acorn MOS
• * Aegis SR1
• * CP/M-86
• * iMAX – OS for Intel's iAPX 432 capability machine
• * MCS
• * MS-DOS
• * PC DOS
• * Pilot
• * UNOS
• * UTS
• * V
• * VERSAdos
• * VRTX
• * VSOS
• * Xinu first release
• 1982
• * Commodore DOS
• * LDOS
• * PCOS
• * pSOS
• * QNX
• * Stratus VOS
• * Sun UNIX 0.7
• * Ultrix
• * Unix System III
• * VAXELN
• 1983
• * Coherent
• * DNIX
• * EOS
• * GNU
• * Lisa Office System 7/7
• * LOCUS – UNIX compatible, high reliability, distributed OS
• * MVS/System Product V2
• * Novell NetWare
• * PERPOS
• * ProDOS
• * RTU
• * STOP – TCSEC A1-class, secure OS for SCOMP hardware
• * SunOS 1.0
• * VSE/System Package Version 1
• 1984
• * AMSDOS
• * CTIX
• * DYNIX
• * Mac OS
• * MSX-DOS
• * NOS/VE
• * PANOS
• * PC/IX
• * ROS
• * Sinclair QDOS
• * SINIX
• * UNICOS
• * Venix 2.0
• * Virtual Machine/Extended Architecture Migration Assistance
• 1985
• * AmigaOS
• * Atari TOS
• * DG/UX
• * DOS Plus
• * Graphics Environment Manager
• * Harmony
• * MIPS RISC/os
• * Oberon – written in Oberon
• * SunOS 2.0
• * Version 8 Unix
• * Virtual Machine/Extended Architecture System Facility
• * Windows 1.0
• * Windows 1.01
• * Xenix 2.0
• 1986
• * AIX 1.0
• * Cronus distributed OS
• * FlexOS
• * GEMSOS – TCSEC A1-class, secure kernel for BLACKER VPN & GTNP
• * GEOS
• * Genera 7.0
• * HP-UX
• * SunOS 3.0
• * TR-DOS
• * TRIX
• * Version 9 Unix
• 1987
• * Arthur
• * BS2000 V9.0
• * IRIX
• * MDOS
• * MINIX 1.0
• * OS/2
• * PC-MOS/386
• * Topaz – semi-distributed OS for DEC Firefly workstation written in Modula-2+ and garbage collected
• * VxWorks
• * Windows 2.0
• 1988
• * A/UX
• * AOS/VS II
• * CP/M rebranded as DR-DOS
• * Flex machine – tagged, capability machine with OS and other software written in ALGOL 68RS
• * GS/OS
• * HeliOS 1.0
• * KeyKOS – capability-based microkernel for IBM mainframes with automated persistence of app data
• * LynxOS
• * Mac OS
• * MVS/System Product V3
• * OS/2
• * OS/400
• * RISC iX
• * SpartaDOS X
• * SunOS 4.0
• * TOPS-10 7.04
• * Virtual Machine/Extended Architecture System Product
• * VAX VMM – TCSEC A1-class, VMM for VAX computers
• 1989
• * Army Secure Operating System – TCSEC A1-class secure, real-time OS for Ada applications
• * EPOC
• * NeXTSTEP
• * OS/2
• * RISC OS
• * SCO UNIX
• * TSX-32
• * Version 10 Unix
• * Xenix 2.3.4

1990s

• 1990
• * AIX 3.0
• * AmigaOS 2.0
• * BeOS
• * DOS/V
• * Genera 8.0
• * iS-DOS
• * LOCK – TCSEC A1-class secure system with kernel and hardware support for type enforcement
• * MVS/ESA SP Version 4
• * Novell NetWare 3
• * OS/2 1.3
• * OSF/1
• * RTEMS
• * PC/GEOS
• * Windows 3.0
• * Virtual Machine/Enterprise Systems Architecture
• * VSE/Enterprise Systems Architecture Version 1
• 1991
• * Amoeba – microkernel-based, POSIX-compliant, distributed OS
• * GNO/ME
• * Linux 0.01-0.1
• * Mac OS
• * MINIX 1.5
• * PenPoint OS
• * RISC OS 3
• * SUNMOS
• * Trusted Xenix – rewritten & security enhanced Xenix evaluated at TCSEC B2-class
• 1992
• * 386BSD 0.1
• * Amiga Unix 2.01
• * AmigaOS 3.0
• * BSD/386, by BSDi and later known as BSD/OS.
• * LGX
• * MPE/iX 4.0
• * MagiC
• * OpenVMS V1.0
• * OS/2 2.0
• * Plan 9 First Edition
• * RSTS/E 10.1
• * SLS
• * Solaris 2.0
• * Windows 3.1
• 1993
• * IBM 4690 Operating System
• * FreeBSD
• * NetBSD
• * Novell NetWare 4
• * Newton OS
• * Nucleus RTOS
• * Open Genera 1.0
• * OS 2200
• * OS/2 2.1
• * PTS-DOS
• * Slackware 1.0
• * Spring
• * Windows NT 3.1
• 1994
• * AIX 4.0, 4.1
• * IBM MVS/ESA SP Version 5
• * NetBSD 1.0
• * OS/2 Warp 3.0
• * Red Hat
• * RISC OS 3.5
• * SPIN – extensible OS written in Modula-3
• 1995
• * Digital UNIX
• * OpenBSD
• * OS/390
• * Plan 9 Second Edition
• * SMSQ/E
• * Ultrix 4.5
• * Windows 95
• 1996
• * AIX 4.2
• * Debian 1.1
• * JN – microkernel OS for embedded, Java apps
• * Mac OS 7.6
• * OS/2 Warp 4.0
• * Palm OS
• * RISC OS 3.6
• * Windows NT 4.0
• * Windows CE 1.0
• 1997
• * AIX 4.3
• * DR-WebSpyder 1.0
• * EPOC
• * Inferno
• * Mac OS 8
• * MINIX 2.0
• * Nemesis
• * RISC OS 3.7
• * SkyOS
• * Windows CE 2.0
• 1998
• * DR-WebSpyder 2.0
• * Junos
• * Novell NetWare 5
• * RT-11 5.7
• * Solaris 7
• * Windows 98
• 1999
• * Amiga OS 3.5
• * AROS
• * Inferno Second Edition
• * Mac OS 9
• * OS/2 Warp 4.5
• * RISC OS 4
• * Windows 98 (2nd edition)

2020s