Editing List of operating systems (section)

==Hobby==
{{Main|Hobbyist operating system}}
* [[AROS]] – AROS Research Operating System (formerly known as Amiga Research Operating System)
* [[AtheOS]] – branched to become [[Syllable Desktop]]
** [[Syllable Desktop (operating system)|Syllable Desktop]] – a modern, independently originated OS; see [[AtheOS]]
* [[BareMetal]]
* DSPnano RTOS
* [[EmuTOS]]
* [[EROS (microkernel)|EROS]] – Extremely Reliable Operating System
* [[HelenOS]] – based on a preemptible microkernel design
* LSE/OS
* [[MenuetOS]] – extremely compact OS with [[GUI]], written entirely in [[FASM]] assembly language
** [[KolibriOS]] – a fork of MenuetOS
* MMURTL<ref>{{cite web|url=http://www.ipdatacorp.com/mmurtl/|title=Book & Source code Download Page|website=IP Data Corporation|access-date=June 17, 2022|archive-date=July 4, 2014|archive-url=https://web.archive.org/web/20140704223135/http://www.ipdatacorp.com/mmurtl/|url-status=dead}}</ref> (Message based MUltitasking Real-Time kerneL, pronounced 'Myrtle')<ref>{{cite book|last=Burgess|first=Richard|date=September 1, 2000|title=MMURTT V1.0|publisher=IP Data Corporation|page=8|isbn=1588530000}}</ref>
* [[SerenityOS]]
* [https://serpaeos.sourceforge.io SerpaeOS]
* [[TempleOS]] – biblical-themed OS, written in HolyC by Terry Davis
* [[ToaruOS]]
** [[ToaruOS#PonyOS|PonyOS]]