Editing Comparison of operating systems (section)

== General information ==
{{clear}}
{| class="wikitable sortable" style="font-size: smaller; text-align: center; width: auto; sortby: name;"
|-
! scope="col" | Name
! scope="col" | Creator
! scope="col" | Initial public release
! scope="col" | Predecessor
! scope="col" | Current stable version
! scope="col" | Release date
! scope="col" | Cost, availability
! scope="col" | Preferred [[Software license|license]]<ref name="license" group="g"/>
! scope="col" | Target system type
|-
! scope="row" | [[IBM AIX|AIX]]	
| [[IBM]]
| 1986
| [[UNIX System V]] Release 3
| 7.3
| {{dts|June 20, 2022}}
| {{Nonfree|Commercial}}
| {{Proprietary}}
| [[Server (computing)|Server]], [[network-attached storage|NAS]], [[workstation]]
|-
! scope="row" | [[AIX/370]]
| [[IBM]]
| 1989
| [[IX/370]]
| Release 2.1?
| {{date table sorting|Feb 22, 1991}}
| {{Nonfree}}
| {{Proprietary}}
| [[IBM System/370]]

AIX/ESA V1 & V2
|-
! scope="row" | [[AIX/ESA]]
| [[IBM]]
| 1992
| [[AIX/370]], [[OSF/1]]
| Version 2 Release 2
| {{date table sorting|Feb 26, 1993}}
| {{Nonfree}}
| {{Proprietary}}
| [[ESA/370]]<br>[[IBM System/390]]
|-
! scope="row" | [[AmigaOS]] classic	
| [[Commodore International]], [[Haage & Partner]], [[Hyperion Entertainment]]
| 1985
| [[TRIPOS]] (as the disk operating component of AmigaOS)
| [[AmigaOS versions#AmigaOS 3.5.2C 3.9|3.2.2.1]]
| {{dts|April 23, 2023}}
| {{Nonfree|Bundled with hardware up to version 3.0 (Amiga International hardware came with 3.1); versions 2.1, 3.0, 3.1, 3.5, 3.9 and the more recent 3.2 (2021) also available as separate packages}}
| {{Proprietary}}, open source clone available under [[AROS]] Public License
| [[Workstation]], [[personal computer]]
|-
! scope="row" | [[AmigaOS 4]]	
| Hyperion Entertainment
| 2004
| AmigaOS classic
| 4.1 Final Edition Update 2.1
| {{dts|2021-01-12}}
| {{Nonfree|4.0 bundled with hardware; 4.0 for classic and 4.1 available as standalone package at €29}}
| {{Proprietary}}
| [[Workstation]], [[personal computer]]
|-
! scope="row" | [[Android (operating system)|Android]]
| [[Android, Inc.]], [[Google]]
| 2008
| None
| [[Android 15|15]]
| {{dts|October 15, 2024}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|AOSP: [[Apache License|Apache-2.0]]<br />Linux: [[GNU General Public License|GPL-2.0-only]]}}
| [[Smartphone]], [[tablet computer]]
|-
! scope="row" | [[ArcaOS]]
| Arca Noae, LLC
| 2017
| OS/2
| 5.1.0
| {{dts|August 27, 2023}}
| {{Nonfree|Personal edition {{US$|139.00}}<br>Commercial edition {{US$|249.00}}}}
| {{Proprietary}}
| [[Server (computing)|Server]], [[workstation]], [[personal computer]]
|-
! scope="row" | [[Classic Mac OS]] <small>([[retronym]]; had no name originally, later Macintosh System Software)</small>
| [[Apple Computer, Inc.]] (now [[Apple Inc.]])
| 1984
| None<ref name="Lisa" group="g" /><ref name="Mac" group="g" />
| 9.2.2
| {{dts|2000}}
| {{Nonfree|Discontinued; Was bundled with [[68k]] and [[PowerPC]] Macs;
versions 7.1-9 sold as retail upgrades<ref>{{Cite book |last=Pogue |first=David |author-link=David Pogue |url=http://www.toddp.com/classic/Software%20Install/Apple%20Support%20Documents/Macintosh%20Secrets/Mac%20Secrets%204th%20ed./ch06.pdf |title=MacWorld Macintosh Secrets 4th edition - Chapter 6: The System Software Museum |page=225 |date=January 1997 |access-date=2017-10-18 |archive-url=https://web.archive.org/web/20171017214028/http://www.toddp.com/classic/Software%20Install/Apple%20Support%20Documents/Macintosh%20Secrets/Mac%20Secrets%204th%20ed./ch06.pdf |archive-date=2017-10-17 |url-status=live}}</ref>}}
| {{Proprietary}}
| [[Workstation]], [[personal computer]]
|-
! scope="row" | [[ChromeOS]]
| [[Google]]
| 2011
| none
| 129.0.6668.99
| {{dts|October 1, 2024}}
| {{Nonfree|Bundled with hardware, [[32-bit x86|32-bit]] edition dropped}}
| {{Proprietary}}: Google OS Terms of Service. Open-source core system
| [[Chromebook]], [[Chromebox]], [[Chromebase]] and [[tablet computer|tablet]]
|-
! scope="row" | [[ChromiumOS]]
| [[Google]]
| 2009
| none
| [[Rolling release]]
| {{dts|October 7, 2021}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[BSD licenses|BSD]]<br />Linux Kernel [[GNU General Public License|GPL-2.0-only]]}}
| [[Personal computer]]
|-
! scope="row" | [[DragonFly BSD]]
| [[Matthew Dillon (computer scientist)|Matthew Dillon]]
| 2003
| FreeBSD
| 6.4.0
| {{dts|June 9, 2022}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[BSD licenses|BSD]]}}
| [[Server (computing)|Server]], [[workstation]], NAS, [[embedded system]]
|-
! scope="row" | [[eComStation]]
| Serenity Systems, Mensys BV
| 2001
| OS/2
| 2.1
| {{dts|May 20, 2011}}
| {{Nonfree|Discontinued; Commercial}}
| {{Proprietary}}
| [[Server (computing)|Server]], [[workstation]], [[personal computer]]
|-
! scope="row" | [[EPOC32]]
| [[Psion PLC]]
| 1996
|
| ER5
| {{dts|1999}}
| {{Nonfree|Discontinued; Commercial}}
| {{Proprietary}}
| [[Personal digital assistant|PDA]]
|-
! scope="row" | [[EulerOS]]
| [[Huawei]]
| 2021
| None
| V2.0SP8
| 2022
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[Open source]]}}
| [[Server (computing)|Server]], [[workstation]]
|-
! scope="row" | [[FreeBSD]]
| The FreeBSD Project
| 1993
| [[386BSD]]
| 14.1
| {{dts|June 4, 2024}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[BSD licenses|BSD]]}}
| [[Server (computing)|Server]], [[workstation]], Desktop, NAS, embedded system
|-
! scope="row" | [[Genode]]
| Genode Labs
| 2008
| None
| {{wikidata|property|edit|reference|Q16527380|P348}}
| {{start date and age|{{wikidata|qualifier|Q16527380|P348|P577}}}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[GNU Affero General Public License|AGPL-3.0-only]]}}
| Desktop, embedded system, [[server (computing)|server]]
|-
! scope="row" | [[GhostBSD]]
| Eric Turgeon
| 2009
| FreeBSD
| 21.05<ref>{{Cite web|url=https://ghostbsd.org/GhostBSD_21.05.11_ISO_now_available|title=GhostBSD 21.05.11 ISO now available|access-date=2021-06-25}}</ref>
| {{dts|May 13, 2021}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[BSD licenses|BSD]]}}
| Desktop, [[workstation]]
|-
! scope="row" | [[Linux]]
| Notable contributors include: [[Richard Stallman]] for [[GNU Project]] and [[Linus Torvalds]] for [[Linux]] and the Unixes they emulated; [[Red Hat]], [[Debian Project]] See: [[Comparison of Linux distributions]] and [[Linux kernel#Development]]
| 1991 (kernel), See: [[Comparison of Linux distributions]] and [[History of Linux]]
| None
| {{wikidata|property|edit|reference|Q14579|P548=Q2804309|P348}} (kernel)
| {{start date and age|{{wikidata|qualifier|Q14579|P548=Q2804309|P348|P577}}}} (kernel)
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[GNU General Public License|GPL-2.0-only]]}} (kernel)
| See: [[Comparison of Linux distributions]]
|-
! scope="row" | [[Haiku (operating system)|Haiku]]
| Haiku Inc.
| 2002
| [[BeOS R5]]
| R1/Beta 5
| September 13, 2024
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[MIT License|MIT]]}}
| [[Personal computer]]
|-
! scope="row" | [[NonStop (server computers)|HP NonStop]]
| [[Hewlett-Packard|HP]] (now [[Hewlett Packard Enterprise]])
| 1976
| None
| H06.24/J06.13
| {{dts|2012}}
| {{Nonfree|Bundled with hardware?}}
| {{Proprietary}}
| HP Nonstop Servers
|-
! scope="row" | [[HP-UX]]
| [[Hewlett-Packard|HP]] (now [[Hewlett Packard Enterprise]])
| 1983
| [[UNIX System V]]
|  HP-UX 11i v3 2023&nbsp;/ May&nbsp;2023
| {{dts|May 2022}}
| {{Nonfree|US$400}}
| {{Proprietary}}
| [[Server (computing)|Server]]
|-
! scope="row" | [[HarmonyOS]]
| [[Huawei]]
| 2019
| [[OpenHarmony]], [[LiteOS]]
| 5.0.0.102(SP3C00E73R4P17)
| October 23, 2024
| {{Nonfree|Bundled with hardware and updates at no cost given to most existing users, subject to hardware requirements}}
| {{Proprietary}} software except for open-source components
| [[Internet of things]], [[Smartphone]], [[tablet computer]], [[educational software|education]], [[embedded system]], [[smart watches]]
|-
! scope="row" | [[IBM i]]	
| [[IBM]]
| 1988
| [[Control Program Facility|CPF]], [[System Support Program|SSP]]
| 7.5
| {{dts|May 10, 2022}}
| {{Nonfree|Bundled with hardware}}
| {{Proprietary}}
| [[Server (computing)|Server]]
|-
! scope="row" | [[Inferno (operating system)|Inferno]]
| [[Bell Labs]]
| 1996
| [[Plan 9 from Bell Labs|Plan 9]]
| Fourth Edition
| {{dts|June 30, 2009}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[MIT License|MIT]]}}
| NAS, [[server (computing)|server]], embedded
|-
! scope="row" | [[iOS]] (originally iPhone OS)
| [[Apple Inc.]]
| 2007
| macOS
| 17.1.1
| {{dts|November 7, 2023 }}
| {{Nonfree|Bundled with hardware and updates at no cost given to most existing users, subject to hardware requirements}}
| {{Proprietary}} higher level API layers; open source core system (ARM versions): [[Apple Public Source License|APSL]], GNU GPL, others
| [[Smartphone]], [[portable media player|music player]], [[tablet computer|tablet]]
|-

! scope="row" | [[IRIX]]
| [[Silicon Graphics|SGI]]
| 1988
| UNIX System V
| 6.5.30
| {{dts|2006}}
| {{Nonfree|Discontinued; Bundled with hardware}}
| {{Proprietary}}
| [[Server (computing)|Server]], [[workstation]]
|-
! scope="row" | [[IX/370]]
| [[IBM]]
| 1985
| UNIX System V
| Release 1.4?
| {{date table sorting|Sep 25, 1987}}
| {{Nonfree}}
| {{Proprietary}}
| [[IBM System/370]]
|-
! scope="row" | [[macOS]] (originally [[Mac OS X]])
| [[Apple Inc.]]
| 2001
| [[NeXTSTEP]], [[Berkeley Software Distribution|BSD]]
| 15.1
| October 28, 2024
| {{Nonfree|Bundled with hardware; No cost for updates and upgrades via Mac App Store for users of Mac OS X 10.6 or later}}
| {{Proprietary}} higher level API layers; open source core system (Apple Silicon-Intel-PowerPC versions): [[Apple Public Source License|APSL]], GNU GPL, others
| [[Workstation]], [[personal computer]], embedded
|-
! scope="row" | [[macOS Server]] (originally [[Mac OS X Server]])
| [[Apple Inc.]]
| 2001
| NeXTSTEP, BSD
| 5.12
| {{dts|May 2, 2021}}
| {{Nonfree|Discontinued; Previously bundled with hardware; No longer a separate operating system, but a group of services installed atop any version of macOS Monterey; US$19.99 on the Mac App Store}}
| {{Proprietary}} higher level API layers; open source core system (Intel-PowerPC versions): APSL, GNU GPL, others
| [[Server (computing)|Server]]
|-
! scope="row" | [[Burroughs MCP|MCP]]
| [[Unisys]]
| 1961
| None
| CP OS 20.0
| {{dts|May 2021}}
| {{Nonfree|Bundled with hardware}}
| {{Proprietary}}
| [[Server (computing)|Server]]
|-
! scope="row" | [[MenuetOS]]
| [[Ville Turjanmaa]] and others
| 2000
| None
| 1.49.00
| {{dts|2023}}
| OS written in assembly language
| {{open source|[[GPL]] or [[Gratis versus libre|No cost]]}}
| [[Workstation]]
|-
! scope="row" | [[MINIX 3]]
| [[Andrew S. Tanenbaum]]
| 2005
| Minix2
| 3.3.0
| {{dts|2014}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[BSD licenses|BSD-3-Clause]]}}
| [[Workstation]]
|-
! scope="row" | [[Multi-Programming Executive|MPE]]
| [[Hewlett-Packard|HP]]
| 1974
| None
| MPE-V
| {{dts|1988}}
| {{Nonfree|Discontinued; Was bundled with HP-3000 CISC hardware "Classic"}}
| {{Proprietary}}
| [[Server (computing)|Server]]
|-
! scope="row" | [[MPE/XL]]
| [[Hewlett-Packard|HP]]
| 1987
| [[Multi-Programming Executive|MPE]]
| 7.5
| {{dts|2002}}
| {{Nonfree|Discontinued; Was bundled with HP-3000 PA-RISC hardware}} <!--discontinued computers, pre PA-RISC, PA-RISC (and OS? available on Itanium?) "MPE, HP intended to make Patches available through December 2015, even after the World Wide End of Support on December 31, 2010"-->
| {{Proprietary}}
| [[Server (computing)|Server]]
|-
! scope="row" | [[MVS]]<br>([[OS/VS2]] R2 through R3.8)
| [[IBM]]
| 1972
| [[OS/360]] MVT, [[OS/VS2 (SVS)|SVS]]
| Release 3.8
| {{dts|1974}}
| {{free|Free (discontinued)}}
| {{open source}}
| [[IBM System/370]]
|-
! scope="row" | [[MVS]]<br>(MVS/SE through MVS/ESA)
| [[IBM]]
| March 1978
| OS/VS2 R3.7 for MVS/SE R1<br>OS/VS2 R3.8 for MVS/SE R2 through MVS/ESA
| [[z/OS]] Version 2.5 (V2R5)
| {{dts|September 30, 2021}}
| {{nonfree|Price tied to processor capacity}}
| {{Proprietary|One Time Charge or monthly}}
| [[IBM System/370|S/370]]
[[IBM System/370-XA|S/370-XA]]
[[IBM Enterprise Systems Architecture#ESA/370 architecture|S/370-ESA]]
[[IBM Enterprise Systems Architecture#ESA/390 architecture|ESA/390]]
|-
! scope="row" | [[NetBSD]]
| The NetBSD Project
| 1993
| [[386BSD]]
| 9.3
| {{dts|August 4, 2022}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[BSD licenses|BSD]]}}
| NAS, [[server (computing)|server]], [[workstation]], embedded
|-
! scope="row" | [[Novell NetWare|NetWare]]
| [[Novell]]
| 1985
| [[Novell S-Net|S-Net]]
| 6.5 SP8
| {{dts|May 6, 2009}}
| {{Nonfree|Superseded by [[Novell Open Enterprise Server]]; Was {{US$|184|2009}} (one-user)}}
| {{Proprietary}}
| [[Server (computing)|Server]]
|-
! scope="row" | [[NeXTSTEP]]
| [[NeXT]]
| 1989
| Unix
| 3.3
| {{dts|1995}}
| {{Nonfree|Discontinued; Was bundled with hardware, then sold separately}}
| {{Proprietary}}
| [[Workstation]]
|-
! scope="row" |[[OpenBSD]]
| OpenBSD Project
| 1996
| NetBSD 1.0
| 7.4
| {{dts|October 16, 2023}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[ISC license|ISC]]}}
| [[Server (computing)|Server]], NAS, [[workstation]], embedded
|-
! scope="row" | [[OpenIndiana]]
| Many, based on software developed by [[Sun Microsystems]] and many others
| 2010
| [[OpenSolaris]]
| 2023.04
| {{dts|April 30, 2021}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[CDDL]]}}
| [[Server (computing)|Server]], [[workstation]]
|-
! scope="row" | [[OpenVMS]]
| [[Digital Equipment Corporation|DEC]] (now VSI)
| 1977
| [[RSX-11]]M
| V9.2-3
| {{dts|November 20, 2024}}
| {{Nonfree|Commercial, no cost for non-commercial use}}
| {{Proprietary}}
| [[Server (computing)|Server]], [[workstation]]
|-
! scope="row" | [[OpenHarmony]]
| Various ([[OpenAtom Foundation]], [[Huawei]] and others)
| 2020
| [[HarmonyOS]], [[LiteOS]]
| 5.0.0 Release
| September 29, 2024
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[Apache License|Apache-2.0]]}}
| [[Internet of things]], [[embedded system]], [[smart watches]], [[Mobile device|mobile devices]], [[Personal computer|personal computers]]
|-
!Oniro
|Various ([[Eclipse Foundation]], [[Huawei]] and others)
|2021
|None
|4.1
|June 21, 2024
|{{Free|[[Gratis versus libre|No cost]]}}
|{{open source|[[Eclipse Public License|Eclipse License]], [[Apache License|Apache-2.0]]}}
|[[Internet of things]], [[embedded system]], [[smart watches]], [[Mobile device|mobile devices]], [[Personal computer|personal computers]]
|-
! scope="row" | [[OS/2]]
| [[IBM]] and [[Microsoft]]
| 1987
| [[MS-DOS]]
| 4.52
| {{dts|2001}}
| {{Nonfree|Discontinued (see ArcaOS successor); Was {{US$|300|2001}} }}
| {{Proprietary}}
| [[Personal computer]], [[server (computing)|server]]
|-
! scope="row" | [[OS/360]]	
| [[IBM]]
| 1966
| None
| Operating System/360 R21.8
| {{dts|August 1972}}
| {{free|Free (discontinued)}}
| {{open source}}
| [[S/360]]<br>[[S/370]]
|-
! scope="row" | [[OS/390]]	
| [[IBM]]
| 1995
| [[MVS/ESA]]
| OS/390 version 2 R10
| {{dts|September 29, 2000}}
| {{nonfree|Price tied to processor capacity}}
| {{Proprietary|One Time Charge or monthly}}
| [[S/390]]
|-
! scope="row" | [[OS 2200]]
| [[Unisys]]
| 1967 as Exec 8e
| [[OS 2200#Exec 8|Exec 8]], OS 1100
| CP OS 18 (Exec 49.2)
| {{dts|July 18, 2018}}
| {{Nonfree|Bundled with hardware}}
| {{Proprietary}}
| [[Server (computing)|Server]]
|-
! scope="row" | [[OS/VS1]]
| [[IBM]]
| {{dts|1972}}
| [[OS/360]] MFT II
| Release 7.0?
|
| {{free|Free (discontinued)}}
| {{n/a}}
| [[IBM System/370]]
|-
! scope="row" | [[OS/VS2]] [[OS/VS2 (SVS)|SVS]]
| [[IBM]]
| {{dts|1972}}
| [[OS/360]] MVT
| Release 1.7
|
| {{free|Free (discontinued)}}
| {{n/a}}
| [[IBM System/370]]
|-
! scope="row" | [[Plan 9 from Bell Labs|Plan 9]]
| [[Bell Labs]]
| 1992
| Unix
| Fourth Edition
| {{dts|2003}} (except for minor later updates)
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[MIT License|MIT]]<ref>{{Cite web|url=https://marc.info/?l=9fans&m=161650489113326|title = '&#91;9fans&#93; Transfer of Plan 9 to the Plan 9 Foundation' - MARC}}</ref>}}
| [[Workstation]], [[server (computing)|server]], embedded system, [[high-performance computing|HPC]]
|-
! scope="row" | [[QNX]]
| QNX Software Systems
| 1982
| [[Unix]], [[POSIX]]
| 7.1.0
| {{dts|July 2020}}
| {{Nonfree|Bundled with BlackBerry 10 and PlayBook devices. Commercial; an academic version exists that needs authorization code before installing}}
| {{Proprietary}}
| Automotive, medical, smartphone, consumer, industrial, embedded system, safety
|-
! scope="row" | [[ReactOS]]
| ReactOS development team
| 1998
| [[Windows NT]] <small>([[clone (computing)|clone]] of)</small>
| 0.4.14
| {{dts|April 9, 2020}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| [[Workstation]], [[personal computer]]
|-
! scope="row" | [[Redox (operating_system)| Redox]]	
| Jeremy Soller
| 2015
| -
| 0.7.0
| {{dts|April 28, 2022}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[MIT License|MIT]]}}
| [[Desktop_computer|Desktop]], [[workstation]], [[server (computing)|server]]
|-
! scope="row" | [[RISC iX]]
| [[Acorn Computers]]
| 1988
| BSD 4.3
| 1.21c
| {{dts|1993}}
| {{Nonfree|Discontinued; Was bundled with hardware}}
| {{Proprietary}}
| [[Workstation]]
|-
! scope="row" | [[RISC OS]]
| Acorn Computers
| 1987
| [[History of RISC OS#Early development|Arthur]]
| 3.71
| {{dts|1997}}
| {{Nonfree|Discontinued; Was bundled with hardware}}
| {{Proprietary}}
| Education, [[personal computer]]
|-
! scope="row" | RISC OS 4
| [[RISCOS Ltd]], [[Pace plc]]
| 1999
| RISC OS
| 4.39
| {{dts|2004}}
| {{Nonfree|Bundled with hardware, then sold separately at £70 (US$127)}}
| {{Proprietary}}
| Education, [[personal computer]]
|-
! scope="row" | RISC OS 5
| [[Castle Technology]], [[RISC OS Open]]
| 2002
| RISC OS 4
| 5.28<ref name='ROOL news 2020-10-24'>{{cite web |url=https://www.riscosopen.org/news/articles/2020/10/24/risc-os-5-28-now-available |title=RISC OS 5.28 now available |access-date=2020-10-24 |last=Revill |first=Steve |date=24 October 2020 |publisher=[[RISC OS Open]]}}</ref>
| {{dts|2020}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[Apache License|Apache-2.0]]}}
| Education, [[personal computer]]
|-
! scope="row" | RISC OS 6
| RISCOS Ltd
| 2006
| RISC OS 4
| 6.20
| {{dts|2009}}<!--not an error... older than RISC OS 5-->
| {{Nonfree|Bundled with hardware, then sold separately at £70 (US$127)}}
| {{Proprietary}}
| Education, [[personal computer]]
|-
! scope="row" | [[SerenityOS]]
| Andreas Kling
| 2018
| None
| [[Continuous integration]]
| N/A
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[BSD-2-Clause]]}}
| [[Workstation]], [[personal computer]]
|-
! scope="row" | [[Solaris (operating system)|Solaris]]
| [[Sun Microsystems|Sun]] (now [[Oracle Corporation]])
| 1992
| [[SunOS]]
| 11.4
| {{dts|August 28, 2018}}
| {{depends|Commercial; (a perpetual license at no cost when used "for the purpose of developing, testing, prototyping and demonstrating your applications"<ref name="Oracle Solaris OTN License">{{cite web|url=http://www.oracle.com/technetwork/licenses/solaris-cluster-express-license-167852.html |title=Oracle Solaris OTN License |publisher=Oracle.com |access-date=2013-10-04}}</ref>)}}
| {{open source|[[Common Development and Distribution License|CDDL]]}}
| [[Server (computing)|Server]], [[workstation]]
|-
! scope="row" | [[XTS-400|STOP 6, XTS-400]]
| [[BAE Systems]]
| 2003
| STOP 5, XTS-300
| 8.2
| {{dts|August 2008}}
| {{Nonfree|{{US$|60,000|2008}}+; bundled with XTS hardware and [[Original equipment manufacturer|OEM licensed]]}}
| {{Proprietary}}
| [[Server (computing)|Server]], [[workstation]]
|-
! scope="row" | [[Symbian]]
| [[Symbian Ltd.]]
| 1998
| EPOC32
| 9.5
| {{dts|2009}}
| {{Nonfree|Discontinued; Commercial}}
| {{Proprietary}}
| [[Smartphone|Phone]]
|-
! scope="row" | Symbian platform
| [[Symbian Foundation]]
| 2010 (initially 1998 as Symbian)
| Symbian
| 3.0.4
| {{dts|2010}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source|[[Eclipse Public License|EPL]]}}
| Embedded system
|-
! scope="row" | [[TempleOS]]
| [[Terry Davis]]
| 2005 (as J Operating System)
| None
| 5.03
| {{dts|2017}}
| {{Free|[[Gratis versus libre|No cost]]}}
| {{open source| [[Public domain]]}}
| [[Personal computer]]
|-
! scope="row" | [[Tru64]]	
| [[Digital Equipment Corporation]]
| January 1992
| [[OSF/1]]
| 5.1B-6
| {{dts|October 1, 2010}}
| {{Nonfree|Bundled with hardware}}
| {{Proprietary}}
| [[Server (computing)|Server]], [[workstation]], [[high-performance computing|HPC]]
|-
! scope="row" | [[ICL VME|VME]]
| [[International Computers Limited|ICL]]
| 1974
| None
| SV294
| {{dts|1994}}
| {{Nonfree|Bundled with hardware}}
| {{Proprietary}}
| [[International Computers Limited|ICL mainframe]]
|-
! scope="row" | [[VSE (operating system)|VSE<sup>n</sup>]]
| 21st Century Software
| 1979 (as DOS/VSE)
| [[DOS/360]]<br>[[DOS/VS]]
| 6.3
| {{dts|2022-05-17}}
| {{Nonfree|Monthly license fee}}
| {{Proprietary}}
| [[IBM Z]]
|-
! scope="row" | [[VxWorks]]
| [[Wind River Systems]]
| 1987
| [[Versatile Real-Time Executive|VRTX]]
| 7
| {{dts|March 2014}}
| {{Nonfree|Paid}}
| {{Proprietary}}
| Embedded real-time system
|-
! scope="row" | Windows (classic 9x family)
| [[Microsoft]]
| 1995
| [[MS-DOS]]
| [[Windows Me]] (Win 4.90.3000)
| {{dts|2000}}
| {{Nonfree|Discontinued}}
| {{Proprietary}}
| [[Personal computer]], media center
|-
! scope="row" | [[Microsoft Windows|Windows]] ([[Windows NT#Releases|NT family]])
| [[Microsoft]]
| 1993
| [[OS/2]] and [[Windows 3.1x]]
| [[Windows 11]] (version 24H2)
| {{dts|June 15, 2024}}
| {{Nonfree|One time license fee}}
| {{Proprietary}}; [[Source-available software|Source-available]]
| [[Workstation]], [[personal computer]], [[home theater PC|media center]], {{nowrap|[[Microsoft Tablet PC|Tablet PC]]}}, embedded system
|-
! scope="row" | [[Windows Server]] (NT family)
| [[Microsoft]]
| 1993
| [[OS/2]]
| [[Windows Server 2025]] (version 10.0.26100.2605)
| November 1, 2024
| {{Nonfree|US$1050 5 CALs server; other editions dependent on number of [[Client Access License|CALs]] purchased}}
| {{Proprietary}}; [[Source-available software|Source-available]]
| [[Server (computing)|Server]], NAS, embedded system
|-
! scope="row" | [[z/OS]]
| [[IBM]]
| 2000
| [[OS/390]]
| Version 2.5 (V2R5)
| {{dts|September 30, 2021}}
| {{nonfree|Price tied to processor capacity}}
| {{Proprietary|One Time Charge or monthly}}
| [[IBM Z]]
|-
! scope="row" | [[z/VM]]
| [[IBM]]
| 2000
| [[VM (operating system)|VM/ESA]]
| 7.4
| {{dts|September 20, 2024}}<ref>{{cite web|url=https://www.vm.ibm.com/zvm740/ |title=Introducing IBM z/VM 7.4|date=August 6, 2024 }}</ref>
| {{Nonfree|Monthly license fee}}
| {{Proprietary}}
| [[IBM Z]]
|-
! scope="row" | [[Magnussoft ZETA|ZETA]]
| [[yellowTAB]]
| 2005
| [[BeOS R5]]
| 1.5
| {{dts|2007}}
| {{Nonfree|Discontinued}}
| {{Proprietary}}
| [[Personal computer]], media center, [[workstation]]
|- class="sortbottom"
! Name
! Creator
! abbr="Initial release" | Initial public release
! Predecessor
! Current stable version
! Release date
! Cost, availability
! Preferred license<ref name="license" group="g"/>
! Target system type
|}

{{Reflist|group="g"|refs=
<ref name="license">Most OS distributions include bundled software with various other licenses.</ref>
<ref name="Lisa">{{cite web|url=https://www.folklore.org/StoryView.py?project=Macintosh&story=Hungarian.txt|title=Hungarian|work=The Original Macintosh Anecdotes}}. Although [[Lisa OS]] ran on the same, but a slower variant, microprocessor and was developed by [[Apple Computer Inc.]] at the same time as [[Classic Mac OS]], they were developed as different projects, only sharing a similar GUI between them.</ref>
<ref name="Mac">[[Mac OS 7.6]] was the first Macintosh system software to be labeled [[Classic Mac OS|Mac OS]]. Operating systems before this were named [[System 1|Macintosh System Software]] through [[System 7|System Software 7.5]], and known as System #.# for short.</ref>
}}