{{multiple issues| {{refimprove|date=November 2011}} {{notability|web|date=June 2025}} }} {{Infobox OS | logo = MirOS Logo | screenshot = 250px | caption = Screenshot of MirOS #10-current/i386 | developer = Thorsten Glaser, Benny Siegert, Ádám Hóka, others | family = Unix, BSD | source_model = Open source | released = OpenBSD-current-mirabilos #0<ref>[https://www.mirbsd.org/history.htm History of MirOS, eMail to Éric Lévénez]</ref> ({{Start date and age|2002|10|11}}) | kernel_type = Monolithic | ui = mksh, IceWM, evilwm | license = Mostly BSD, GPL, MirOS Licence | working_state = Current <ref>{{Cite web|url=http://www.mirbsd.org/|title=MirBSD: Welcome at MirBSD|website=www.mirbsd.org|accessdate=30 March 2023}}</ref> | website = {{URL|www.mirbsd.org}} | supported_platforms = i386, SPARC | updatemodel = Binary security updates for stable releases | package_manager = MirPorts, pkgsrc }}
'''MirOS BSD''' (originally called '''MirBSD''') is a free and open source operating system which started as a fork of OpenBSD 3.1 in August 2002.<ref name="origins">[https://www.mirbsd.org/permalinks/wlog-10_e20100828-tg.htm#e20100828-tg_wlog-10 Birthing point for MirOS]</ref> It was intended to maintain the security of OpenBSD with better support for European localisation. Since then it has also incorporated code from other free BSD descendants, including NetBSD, MicroBSD (owned by DamnSmallBSD<ref>{{cite web | url=https://damnsmallbsd.org/MicroBSD/ | title=MicroBSD }}</ref>) and FreeBSD. Code from MirOS BSD was also incorporated into ekkoBSD, and when ekkoBSD ceased to exist, artwork, code and developers ended up working on MirOS BSD for a while.
Unlike the three major BSD distributions, MirOS BSD supports only the x86 and SPARC architectures.
== History == MirOS BSD originated as ''OpenBSD-current-mirabilos'', an OpenBSD patchkit, but became a separate project after differences in opinion between the OpenBSD project leader Theo de Raadt and Thorsten Glaser.<ref name="origins" /><ref>{{Cite web|url=https://marc.info/?l=openbsd-misc&m=103065681303974&w=2|title='Re: Initial patch of NetBSD /usr/games/wtf + /usr/share/misc/acronyms' - MARC|website=marc.info|accessdate=30 March 2023}}</ref> Despite the forking, MirOS BSD was synchronised with the ongoing development of OpenBSD, thus inheriting most of its good security history, as well as NetBSD and other BSD flavours.<ref>{{Cite web|url=http://bsdmag.org/magazine/788-explore-netbsd|archive-url=https://web.archive.org/web/20090916165125/http://www.bsdmag.org/magazine/788-explore-netbsd|url-status=usurped |archive-date=September 16, 2009|title=MirOS BSD: the peaceful operating system|work=BSD Magazine |issue=1/2009 (3)|page=16|accessdate=30 March 2023}}</ref>
One of the project's goals was to be able to port the MirOS userland to run on the Linux kernel, hence the deprecation of the MirBSD name in favour of MirOS. While ''MirOS Linux'' (linux kernel + BSD userland) was discussed by the developers sometime in 2004,<ref>{{Cite web|url=http://www.mirbsd.org/wlog-7.htm|title=MirBSD: MirBSD Weblog|website=www.mirbsd.org|accessdate=30 March 2023}}</ref> it has not materialised.
== See also == {{Portal|Free and open-source software}} * Comparison of BSD operating systems
== References == {{reflist}}
== External links == * {{official website|https://www.mirbsd.org/}}
{{Berkeley Software Distribution}}
Category:Berkeley Software Distribution Category:OpenBSD Category:Software forks Category:Rolling release Linux distributions