Editing List of operating systems (section)

===Non-Unix===
* [[Cosmos (operating system)|Cosmos]] – written in C#
* [[EmuTOS]] - open source [[Atari TOS]] variant
* [[FreeDOS]] – open source [[MS-DOS]] variant
* [[Genode]] – operating system framework for microkernels (written in C++)
* [[Fuchsia (operating system)|Google Fuchsia]]
* [[Haiku (operating system)|Haiku]] – open source inspired by [[BeOS]], in development
* [[Incompatible Timesharing System]] (ITS) – written in the MIDAS [[macro assembler]] language for the [[PDP-6]] and [[PDP-10]]<ref>{{cite web|url=http://www.bitsavers.org/pdf/mit/ai/aim/AIM-161A.pdf|title=ITS 1.5 Reference Manual|page=6|date=July 1969}}</ref> by [[Massachusetts Institute of Technology|MIT]] students
* [[LiteOS]]
* [[MagiC]] - open source [[Atari TOS]] variant
* [[OpenHarmony]] - LiteOS kernel and kernel add-ons side of the kernel tree under Kernel Abstract Layer (KAL) structure
* [[OpenHarmony|Uniproton]] real-time operating system for ultra-low latency and adaptable mixed-critical deployment capabilities contributed by [[EulerOS|openEuler]] community and also part of OpenHarmony add-on kernel
* [[OS/2#Future|osFree]] – OS/2 Warp open source clone
* [[OSv]] – written in C++
* [[Phantom OS]] – persistent object-oriented
* [[ReactOS]] – open source OS designed to be binary compatible with [[Windows NT]] and its variants ([[Windows XP]], [[Windows 2000]], etc.); in development
* [[SharpOS]] – written in .NET C#
* [[Visopsys]] – written in C and assembly by Andy McLaughlin
* [[Quantix]]