variant) OpenBSD forked from NetBSD Bitrig forked from OpenBSD, discontinued Fugulta, an openbsd desktop fork by japanese developers Darwin, created by Apple using code from NeXTSTEP, FreeBSD, and NetBSD GNU (also known as GNU/Hurd) Linux (see also List of Linux distributions) (alleged to be GNU/Linux see GNU/Linux naming controversy) Android Android-x86 Remix OS EulerOS - Linux commercial distribution for cloud based software by Huawei Redox (written in Rust) OpenSolaris illumos, contains original Unix (SVR4) code derived from the OpenSolaris (discontinued by Oracle in favor of Solaris 11 Express) OpenIndiana, operates under the illumos Foundation. Uses the illumos kernel, which is a derivative of OS/Net, which is basically an OpenSolaris/Solaris kernel with the bulk of the drivers, core libraries, and basic utilities. Nexenta OS, based on the illumos kernel with Ubuntu packages SmartOS, an illumos distribution for cloud computing with Kernel-based Virtual Machine integration. RTEMS (Real-Time Executive for Multiprocessor Systems) Syllable Desktop VSTa Plurix (or Tropix) (by Federal University of Rio de Janeiro – UFRJ) TUNIS (University of Toronto) Xv6 - a simple Unix-like teaching operating system from MIT SerenityOS - aims to be a modern Unix-like operating system, yet with a look and feel that emulates 1990s operating systems such as Microsoft Windows and the classic Mac OS. LiteOS OpenHarmony Non-Unix 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++) Ghost OS – written in assembly, C/C++ 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 by MIT students MagiC - open source Atari TOS variant 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# TempleOS – written in HolyC Visopsys – written in C and assembly by Andy McLaughlin Research Unix or Unix-like Plan 9 from Bell Labs – distributed OS developed at Bell Labs, based on original Unix design principles yet functionally different and going much further Inferno – distributed OS derived from Plan 9, originally from Bell Labs 9front, a derivative open-source project made to resurrect Plan 9 to passionate developers Research Unix Non-Unix