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__NOTOC__
__NOTOC__
This page maintains a list of top 10 operating system projects considered to be notable. An operating system is considered notable if it has received some form of success outside of the relatively tiny sphere of hobby operating system development ( e.g. has had a full release, is self-hosting, has been reported on outside of the hobby OSdev world, etc.) or if it has achieved such notability within the operating system development community as a useful answer to the question, "I want to see what kind of operating systems you guys have built"
This page maintains a list of operating system projects considered to be notable. An operating system is considered notable if it has received some form of success outside of the relatively tiny sphere of hobby operating system development (e.g. has had a full release, is self-hosting, has been reported on outside of the hobby OSdev world, etc.) or if it has achieved such notability within the operating system development community as a useful answer to the question, "I want to see what kind of operating systems you guys have built"


If you believe your project meets one or more of the criteria above, feel free to add it to the list. The worst that could happen is you fall out of notability due to inactivity.
If you believe your project meets one or more of the criteria above, feel free to add it to the list. The worst that could happen is you fall out of notability due to inactivity.


Everyone is welcome to add their own projects to the regular [[Projects]] list of all hobbyist operating systems
Everyone is welcome to add their own projects to the regular [[Projects]] list of all hobbyist operating systems

'''Contents:''' [[#0|0]] [[#1|1]] [[#2|2]] [[#3|3]] [[#4|4]] [[#5|5]] [[#6|6]] [[#7|7]] [[#8|8]] [[#9|9]] [[#10|10]]


== Active Notable Alternative Operating Systems ==
== Active Notable Alternative Operating Systems ==


{{OSProject
= 0 =
|OSName=9front
|OSDescription=Plan9front (or 9front) is a fork of the Plan 9 from Bell Labs operating system. The project was started to remedy a perceived lack of devoted development resources inside Bell Labs, and has accumulated various fixes and improvements.
|Contact=http://lists.9front.org/
|License=Open source
|URL=http://lists.9front.org/
|Status=Active (2017-12-17)
|Pic=[[File:9front.png|200px]]
}}


{{OSProject
{{OSProject
|OSName=Kolibri OS
|OSName=BareMetal
|OSDescription=BareMetal is a 64-bit OS for x86-64 based computers. The OS is written entirely in Assembly while applications can be written in Assembly or C/C++. The two main purposes of BareMetal are for educational uses in learning low-level OS programming in 64-bit Assembly and to be used as a base for a high-speed data processing node. Source code is well documented and freely available. As of version 0.4.9 BareMetal OS officially supports multiple processors, memory management, and Ethernet communications.
|OSDescription=Kolibri OS was a fork of the 32-bit version of Menuet OS but has changed much along the way. Despite fitting on a standard 1.44 MB floppy, this wonderful OS contains: the complete GUI desktop, a lot of drivers and great software (such as web browser and music player), system programs and games! The Kernel and most applications, libraries and drivers are written in FASM, but some are in C-- (https://en.wikipedia.org/wiki/C-- ; link to their C-- compiler: http://c--sphinx.narod.ru/). At this OS you can write the ASM code and execute it after assembling. Source code is open - http://websvn.kolibrios.org/listing.php?repname=Kolibri+OS - and the contributions are welcome!
|Contact=The Kolibri OS team
|Contact=Ian Seyler (ian.seyler at returninfinity.com)
|URL=http://www.returninfinity.com/
|License=Open source (GNU GPLv2)
|Status=Active (2018-03-06)
|URL=http://www.kolibrios.org
|Status=Latest commit: 2018-04-06, is active
|FloppyAvailable=Fits on a floppy! :)
|Pic=[[File:KolibriOS.png|240px]]
}}
}}

= 1 =


{{OSProject
{{OSProject
|OSName=FreeDOS
|OSName=FreeDOS
|OSDescription=Today, FreeDOS is ideal for anyone who wants to bundle a version of DOS without having to pay a royalty for use of DOS. FreeDOS will also work on old hardware and embedded systems. FreeDOS is also an invaluable resource for people who would like to develop their own operating system. While there are many free operating systems out there, no other free DOS-compatible operating system exists. Sources are here: http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/repositories/1.2/
|OSDescription=Today, FreeDOS is ideal for anyone who wants to bundle a version of DOS without having to pay a royalty for use of DOS. FreeDOS will also work on old hardware and embedded systems. FreeDOS is also an invaluable resource for people who would like to develop their own operating system. While there are many free operating systems out there, no other free DOS-compatible operating system exists.
|Contact=Jim Hall, the mailing lists at http://www.freedos.org/lists/
|Contact=The mailing lists at http://www.freedos.org/lists/
|License=Open source (GNU GPLv2)
|License=Open source (GNU GPLv2)
|URL=http://www.freedos.org
|URL=http://www.freedos.org
|Status=Latest release: 2016-12-25, is active
|Status=Active (2016-12-25)
|FloppyAvailable=Fits on a floppy! :)
|Pic=[[File:FreeDOS.png|200px]]
|Pic=[[File:FreeDOS.png|200px]]
}}
}}


{{OSProject
= 2 =
|OSName=[[User:max/Ghost Kernel|Ghost OS]]
|OSDescription=A homemade operating system with a microkernel for the IA32 (x86) platform. The project is written in C++ and Assembly. Features: multiprocessor- & multitasking support, kernel API library, custom C library, ELF support, IPC (messages, signals, shared memory, pipes), VFS, window server & GUI with homemade toolkit, PS/2 keyboard & mouse driver, VESA video driver and more...
|Contact=Max Schlüssel (lokoxe@gmail.com)
|URL=https://ghostkernel.org/
|LastReleaseYear=2017
|LastReleaseMonth=4
|LastReleaseDay=21
|LastReleaseDescription=0.5.6
|Status=(Inactive)
|Pic=[[Image:ghost-ui-preview.png|120px]]
|License=GPLv3
}}


{{OSProject
{{OSProject
|OSName=Visopsys
|OSName=Kolibri OS
|OSDescription=Kolibri OS was a fork of the 32-bit version of Menuet OS but has changed much along the way. Despite fitting on a standard 1.44 MB floppy, this wonderful OS contains: the complete GUI desktop, a lot of drivers and great software (such as web browser and music player), system programs and games! The Kernel and most applications, libraries and drivers are written in FASM, but some are in C-- (https://en.wikipedia.org/wiki/C-- ; link to their C-- compiler: http://c--sphinx.narod.ru/). At this OS you can write the ASM code and execute it after assembling. Source code is open - http://websvn.kolibrios.org/listing.php?repname=Kolibri+OS - and the contributions are welcome!
|OSDescription=Visopsys (VISual OPerating SYStem) is an alternative operating system for PC-compatible computers, written “from scratch”, and developed primarily by a single hobbyist programmer since 1997. Its primary "useful feature" is a reasonably functional partition management program - the ‘Disk Manager’, which can create, format, delete, resize, defragment, copy, and move partitions, and modify their attributes. It supports both DOS/MBR and UEFI partition tables. It can also copy hard disks, and has a simple and friendly graphical interface. A basic version can fit on a bootable floppy disk, or you can use the entire system from a ‘live’ CD/DVD
|Contact=Andy McLaughlin, andy [at] visopsys [dot] org
|Contact=The Kolibri OS team
|License=Open source (GNU GPLv2)
|License=Open source (GNU GPLv2)
|URL=http://visopsys.org/
|URL=http://www.kolibrios.org
|Status=Latest release: 2018-03-05, is active
|Status=Active (2017-12-28)
|Pic=[[File:KolibriOS.png|240px]]
|FloppyAvailable=Fits on a floppy! :)
|Pic=[[File:Visopsys.png|240px]]
}}
}}


{{OSProject
= 3 =
|OSName=KnightOS
|OSDescription=Open-source operating system for Texas Instruments calculators. Features preemptive multitasking, memory management, etc. Written in z80 assembly.
|Contact=Drew DeVault (sir at cmpwn.com)
|URL=http://knightos.org
|Status=Mature SDK, usable kernel, usable userspace
}}


{{OSProject
{{OSProject
|OSName=MikeOS
|OSName=Haiku
|Contact=haiku-development at freelists.org
|OSDescription=MikeOS is an operating system for x86 PCs, written in assembly language. It is a learning tool to show how simple 16-bit, real-mode OSes work, with well-commented code and extensive documentation. It has a BASIC interpreter with 46 instructions, supports over 60 syscalls, could manage a serial terminal connection and output the sound through PC speaker. There is also a file manager, text editor, image viewer and some games
|OSDescription=Fully featured open source operating system inspired by the commercial Be Operating System. Has a preemptive, modular kernel, reasonable POSIX compatibility, a nice (non-X11-based) GUI, and a wide variety of ported and native applications (including a WebKit based browser). Nearly the entire operating system is written in C++98 (including the kernel), albeit with little usage of exceptions.
|Contact=Mike Saunders, okachi [at] gmail [dot] com
|URL=https://www.haiku-os.org/
|License=Open source
|LastReleaseYear=2012
|URL=http://mikeos.sourceforge.net/
|LastReleaseMonth=11
|Status=Latest commit: 2016-12-04 ; Latest release: 2014-12-21
|LastReleaseDay=14
|FloppyAvailable=Fits on a floppy! :)
|LastReleaseDescription=R1 alpha 4.1
|Pic=[[File:MikeOS.png|240px]]
|Status=(Nightly/dev builds active)
}}
}}


{{OSProject
= 4 =
|OSName=LK (Little Kernel)
|Contact=Travis Geiselbrecht (travisg at gmail.com)
|OSDescription=An open source embedded multiprocessor kernel for ARM, x86, x86-64. Other platforms are work-in-progress and are in various stages of development with varying activity.
|URL=https://github.com/littlekernel/lk
|Status=Active
}}


{{OSProject
{{OSProject
|OSName=Vanadium OS
|OSName=Pedigree
|OSDescription=Monolithic OS with several backends supported - x86, x64, MIPS32, ARM and PowerPC. Kernel written in C++ with the obvious bits of ASM. Offers a reasonable amount of POSIX support and a tiling GUI and can run Apache, DOSBox, and various other common programs. Planned to also offer a native API alongside POSIX for Pedigree-specific applications.
|OSDescription=Vanadium OS is a multi-user Unix-like OS. i386, amd64. Fully protected mode. Memory, file and hardware protection. root and unprivileged users. GUI without X, modular kernel, and has a live floppy image with a single user mode! My homepage: http://www.durlej.net/contact ; project pages: http://www.durlej.net/v/ , http://www.durlej.net/nameless , https://github.com/p-durlej/newsys . One of the great features is that you can write C code and instantly compile it to execute
|Contact=Piotr Durlej, http://www.durlej.net/contact
|Contact=JamesM, bluecode, [http://ideasandcode.blogspot.com/ pcmattman], IRC freenode.net#pedigree
|URL=http://www.pedigree-project.org/
|License=Open source (BSD 2-clause)
|Status=[http://www.pedigree-project.org/projects/pedigree/wiki/Foster_Milestone_1 Foster Milestone #1] (most recent release).
|URL=https://github.com/p-durlej/newsys
|Status=Latest release: 2018-02-13, is active
|FloppyAvailable=Fits on a floppy! :)
|Pic=[[File:VanadiumOS.png|240px]]
}}
}}

= 5 =


{{OSProject
{{OSProject
|OSName=Snowdrop OS
|OSName=SeaOS
|OSDescription=SeaOS is a hybrid kernel with loadable modules that supports ATA, AHCI, EXT2, ELF, and many other fancy acronyms.
|OSDescription=Snowdrop OS is a small-scale 16-bit real mode operating system for the IBM PC architecture. Snowdrop was developed from scratch, using only assembly language. Snowdrop boots from a FAT12 filesystem (floppy disk) and comes with a shell, aSMtris (a Tetris clone), and a few other example programs that could greatly simplify the development - for example, see http://sebastianmihai.com/snowdrop/gamedev.php
It has basic networking support, initial VT-x support, and is self-hosting with a fairly complete unix-like userland. Designed for simplicity.
|Contact=email address on website below
|Contact=Daniel Bittman (danielbittman1 at gmail.com)
|License=Open source (Public Domain)
|URL=http://sebastianmihai.com/snowdrop/
|URL=http://dbittman.github.io/seaos
|Status=Latest update: 2018-03-27, is active
|Status=Active Development
|FloppyAvailable=Fits on a floppy! :)
|Pic=[[File:SnowdropOS.png|240px]]
}}
}}

= 6 =


{{OSProject
{{OSProject
|OSName=PrettyOS
|OSName=Sortix
|OSDescription=Sortix is a small self-hosting operating-system aiming to be a clean and modern POSIX implementation. It is a hobbyist operating system written from scratch with its own base system, including kernel and standard library, as well as ports of third party software. It has a straightforward installer and can be developed under itself. Releases come with the source code in /src, ready for tinkering.
|OSDescription=OS with a simple kernel created for educational purposes. A great care is put on keeping the code as readable as possible. PrettyOS is written in C and some i386 assembly (own bootloader). PrettyOS offers network, FAT12/16/32, uhci, ohci, ehci, xhci. My homepage: http://prettyos.de
|Contact=Dr. Erhard Henkes, http://prettyos.de
|Contact=https://sortix.org/
|License=Open source (BSD)
|License=Open source (ISC)
|LastReleaseYear=2016
|URL=https://sourceforge.net/p/prettyos/code/HEAD/tree/
|LastReleaseMonth=3
|Status=Latest commit: 2017-06-17, is active
|LastReleaseDay=28
|FloppyAvailable=Fits on a floppy! :)
|LastReleaseDescription=1.0
|Pic=[[File:PrettyOS.png|240px]]
|URL=https://sortix.org/
|Pic=[[File:Sortix.png|200px]]
}}
}}

= 7 =


{{OSProject
{{OSProject
|OSName=[[User:Klange/ToaruOS|とあるOS (ToAruOS)]]
|OSName=tatOS
|OSDescription=32-bit modular kernel written in C. Supports pipes, shared memory, signals, POSIX-compliant file access, threading, audio, IPv4. Heavy focus on advanced GUI, including a compositing window system.
|OSDescription=A 32bit x86 OS written in assembly featuring a protected mode driver for USB flash drive and mouse. Source package includes tedit editor and ttasm assembler. Supports UHCI, EHCI, PS2 keyboard and 800x600x8bpp graphics - has a basic GUI
|Contact=Tom Timmermann
|Contact=#toaruos on irc.freenode.net
|URL=http://toaruos.org/
|License=Open source
|LastReleaseYear=2017
|URL=https://github.com/tatimmer/tatOS
|LastReleaseMonth=8
|Status=Latest commit: 2016-07-23, is active
|LastReleaseDay=2
|FloppyAvailable=Fits on a floppy! :)
|LastReleaseDescription=1.2.1
|Pic=[[File:TatOS.png|200px]]
|Status=(Active)
|License=NCSA/University of Illinois License
|Pic=[[Image:Toaruos_screenshot.png|120px]]
}}
}}

= 8 =


{{OSProject
{{OSProject
|OSName=Dawn
|OSName=Visopsys
|OSDescription=Visopsys (VISual OPerating SYStem) is an alternative operating system for PC-compatible computers, written “from scratch”, and developed primarily by a single hobbyist programmer since 1997. Its primary "useful feature" is a reasonably functional partition management program - the ‘Disk Manager’, which can create, format, delete, resize, defragment, copy, and move partitions, and modify their attributes. It supports both DOS/MBR and UEFI partition tables. It can also copy hard disks, and has a simple and friendly graphical interface. A basic version can fit on a bootable floppy disk, or you can use the entire system from a ‘live’ CD/DVD
|OSDescription=Dawn is a modern multitasking graphical operating system that targets the SUBLEQ instruction set. The goal of Dawn is to allow everyone to build compatible hardware with little cost, and easily create emulators for it for every platform. Dawn comes with basic tools such as a text editor, paint program, image viewer, and wave player. Dawn is self-hosting, and it has a built-in C compiler with documentation.
|Contact=https://visopsys.org/about/
|Contact=http://gerigeri.uw.hu/DawnOS/download.html , e-mail address at the bottom of this page
|License=Freeware (source code unavailable)
|License=Open source (GNU GPLv2)
|URL=http://gerigeri.uw.hu/DawnOS/download.html
|URL=http://visopsys.org/
|Status=Latest release: 2018-03-19, is active
|Status=Active (2017-06-07)
|Pic=[[File:Dawn.png|240px]]
|Pic=[[File:Visopsys.png|240px]]
|FloppyAvailable=None, size: 256 MB
}}
}}

= 9 =


{{OSProject
{{OSProject
|OSName=9front
|OSName=MikeOS
|OSDescription=MikeOS is an operating system for x86 PCs, written in assembly language. It is a learning tool to show how simple 16-bit, real-mode OSes work, with well-commented code and extensive documentation. It has a BASIC interpreter with 46 instructions, supports over 60 syscalls, could manage a serial terminal connection and output the sound through PC speaker. There is also a file manager, text editor, image viewer and some games
|OSDescription=Plan9front (or 9front) is a fork of the Plan 9 from Bell Labs operating system. The project was started to remedy a perceived lack of devoted development resources inside Bell Labs, and has accumulated various fixes and improvements. Our homepage: http://9front.org/ , our artwork: http://9front.org/propaganda/
|Contact=Mike Saunders, okachi [at] gmail [dot] com
|Contact=http://lists.9front.org/
|License=Open source
|License=Open source
|URL=https://code.9front.org/hg/plan9front
|URL=http://mikeos.sourceforge.net/
|Status=Latest update: 2018-04-17, is active
|Status=Latest commit: 2016-12-04 ; Latest release: 2014-12-21
|Pic=[[File:MikeOS.png|240px]]
|FloppyAvailable=Too fat for a floppy! >500 MB size
|Pic=[[File:9front.png|200px]]
}}
}}

= 10 =


{{OSProject
{{OSProject
|OSName=[[wikipedia:TempleOS|TempleOS]]
|OSName=Vanadium OS
|OSDescription=Vanadium OS is a multi-user Unix-like OS. i386, amd64. Fully protected mode. Memory, file and hardware protection. root and unprivileged users. GUI without X, modular kernel, and has a live floppy image with a single user mode! My homepage: http://www.durlej.net/contact ; project pages: http://www.durlej.net/v/ , http://www.durlej.net/nameless , https://github.com/p-durlej/newsys . One of the great features is that you can write C code and instantly compile it to execute
|OSDescription=TempleOS is a 64 bit lightweight OS with multitasking and multicore support, which is ring-0-only and works in a single address space. It provides the interface for communicating with God: the user has to choose a random number from the constantly changing sequences and then it is converted to the text interpretation. Whole OS with its' software has been single-handedly created during 15 years by Terry A Davis - who also developed a programming language called Holy C together with a special compiler for it. TempleOS supports the FAT32 and RedSea filesystems (the latter created by Terry) and also the file compression. It doesn't support the networking, partially for ideological reasons, but there are forks available with added functionality
|Contact=Terry A Davis, http://www.templeos.org
|Contact=Piotr Durlej, http://www.durlej.net/contact
|License=Open source (Public Domain)
|License=Open source (BSD 2-clause)
|URL=http://templeos.org/
|URL=https://github.com/p-durlej/newsys
|Status=Latest update: 2018-01-29, is active
|Status=Latest release: 2017-12-13, is active
|Pic=[[File:VanadiumOS.png|240px]]
|FloppyAvailable=Could fit on a floppy, but no-one has tried :P
|Pic=[[File:TempleOS.png|240px]]
}}
}}