Preemptive Kernel Patch - papersfiles’s blog

Kpatch is a feature of the Linux kernel that implements live patching of a running kernel, which allows kernel patches to be applied while the kernel is still running.

This page maintains a list of academic, personal, and small non-commercial operating systems. For information regarding commercial or main-stream operating systems visit Wikipedia.

The type of operating systems listed here have a high mortality rate. This list was off-line from 09-04-2004 until 06-17-2006 and during that time 112 of 213 operating system projects disappeared from the internet leaving only 101 submitted. Looking at how often these projects are started by using the OS Project Announcement forum we can see that between 11-24-2004 and 6-21-2006 around 68 projects were announced many of which disappeared before being added here. The current total is 183 projects as of , 7th December 2009 GMT 12. Please help keep this list current by correcting it yourself if you have a login id or by posting a message on the OSDevWiki forum pointing out the incorrect entry.

Contents: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A2 - It is an operating system and an integrated software environment developed at ETH in Zürich. It is a single-user, multi-core, multi-tasking system that runs on bare hardware or on top of a host operating system currently Microsoft Windows or Linux. The developers aim at producing a reliable, real-time operating system suitable for embedded systems and for industrial and in particular medical applications. Earlier, A2 was called Aos Active Object System, a nomenclature that is still in use. It is written in the Active Oberon programming language, which evolved from Oberon, a programming language in the Pascal/Modula tradition. The graphical user interface is referred to as Bluebottle.

Ace OS - This OS is mainly deal with the hardware specifications. It is coded in C,C MingW and Assembly NASM. I does not want to compete with Windows or Linux. Simply it is an 32bit multitasking operating system for IA32 developed for experimental and exploration purpose. The next version Ace 2.0 will capale of handling DLL files also.

Acess2 - Acess2 is a kernel and operating system designed to do what Linux does, be customizable to any given situation. However, unlike Linux, it there is no need to maintain backwards compatibility with anything. It features a simple, but extensible VFS that currently supports VFAT and Ext2 and network support is on the way.

AdaOS - Project to develop a fully distributed OS written mainly in Ada. Primary aim will be at desktop workstation. Will be secure, object-oriented, with GUI.

Adelian - A desktop OS based on our RTOS MDOS. Designed from scratch, this completely modular OS features a GUI, CLI, VFS, sound etc etc.

Contact: Gary Partis, info adelian.co.uk

URL:

Status: -- Complete nano-kernal plus many completed modules

Agnix - Agnix is a small operating system kernel for i386, supporting 32-bit protected memory mode, paging, hardware switched tasks, memory tests RW, ECC, address patterns, PCI bus, devices, PCI IRQ routing, RT timers and network protocols. Agnix is available with all the source code and is fully compatible with the Linux Kernel API. Agnix has been written from scratch by Lukas Dembinski.

Aksel - Aksel is a small operating system kernel for i386 in ASM and C with partly ported newlib still in development. Source for the different stages of the development are available to download. It is a great learning tool.

Contact: Ivan idiprima hotmail.com

Status: November 26, 2010 -- only a few commands implemented and no fs yet.

Alt Ctrl Delet - Polish OS Project

Contact: mrkaktus AT wp.pl

Status:

The validity of this entry is questionable;

WARNING. This URL Website is not in English and contains front page ads which you need to click on the image to access this site. This site is under review

altOSdev - Just another view on how should OS be designed.

Amateur OS - A real time, minimum kernel operating system for doing DSP work and amateur radio digital modes.

Amiga Research Operating System, - AROS aims to create a free open source AmigaOS like OS and make it better then the original.

Contact: Ola Jensen ola AT aros.org

Anix Operating System, - Anix is a Operating System written mainly in C it currently supports FAT12 and Preemptive multithreading in addition to paging.

AntiTux - AntiTux is a C OS aiming to be up to par with Linux. In development.

AOS Advanced Operating System - A not big yet OS written in C. Work in progress.

I DON T WANT TEAM-MEMBERS yet.

Currently in development.

Aprom - Aprom is a weird, modular 32bit OS. Tightly bound design, roughly microkernel. Been in development every now and then over the past decade. A spontaneous fusion of a large algorithms library.

Asgard - A small kernel for research into the feasibility of the OSKit and redistributable components in general, written in FreeBASIC, with a port of the Python interpreter. WORK IN PROGRESS. Ideas and contributions welcome.

AtlantisOS - Currently in redesign and reimplementation 3rd time s a charm right. the new version supports the Bochs VBE adapter and IDE devices. It boots only on 64-bit machines.

Contact: Candy dascandy gmail.com

Status: -- -

Asmadian - A currently 32-bit OS but will later have a 64-bit version that runs on a custom microkernel. Although it s partly based on UNIX, it is not fully compatible with any standard won t even use INT80, INT70 will be used instead.. It will be put into a whole OS with a GUI, under the name AsmadianOS

Aurora - Aurora is a simple learning/research kernel at the moment, that is slowly but gradually becoming a multitasking modular kernel.

AWOS Andrew Wilcox - AWOS is an operating system that will CONQUER THE WORLD. No, but check it out.

BareMetal - 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.

BCOS - BCOS is a practical distributed operating system, initially aimed at 80x86/PC compatible computers. In general BCOS is meant to eventually make a group of computers connected by a network a cluster of computers behave like a single computer with multiple users.

BOS - BOS is a new 32-bit Operating System designed with DOS in mind. That means no protection, no multitasking, no paging, and no to a lot of other things often related with new 32-bit OS:es. But despite it s lack of protection it will still be a modern OS with native support for CD-ROM/BURNER, DVD, USB, most filesystems, up to 4gb of memory etc. This is a OS for all those people that miss the days of DOS programming.

BRiX - safe-language/OS hybrid - persistent database filesystem - reconfigurable graphical interface

Contact: Brand Huntsman

CakeOS - CakeOS Cake is a 32 bit operating system for x86 designed to be easy to use, with an interface that is both unique and yet instinctive. It is currently under development, with support for tasking, a dynamic heap, a 32bpp vesa/vga driver with mouse support, a basic shell and window manager, and several drivers in development. Cake has many ambitious aims for desktop usage.

Caldera - Caldera is a 32-bit protected mode OS with: currently partial POSIX emulation,VESA VGA support,basic multitasking,and dynamic loading of drivers.

Contact: KotuxGuy

URL: No URL

Status: -- Under Development

Capital OS - Capital is an Object Oriented Operating System being developed for iPAX386 processors. It features a multithreading tasking model. The kernel itself is multithreaded and is fully preemptible giving support for Real Time processes. The memory model is a paged virtual memory system. A hardware interface layer is envisaged. It follows a totally Object oriented design with all designing done in UML. It is being written in C, C and of course, Assembly.

CapROS The Capability-based Reliable Operating System - CapROS is a new operating system that merges some very old ideas about capabilities with some newer ideas about performance and resource management. The result is a small, secure, real-time operating system that provides orthogonal persistence.

Contact: No Contact Information

Caracal - Caracal started life as a hobby OS which was going to make it as far as a hello world kernel. Since I got the OS Dev bug it has now grown to a multiboot compatible pmode32 OS with multitasking support. Caracal has just undergone a redesign, where the boot loader has been made much more versatile and the kernel now uses a separate arch tree to enable easier porting. Currently, the i586 and x86_64 versions of the kernel are under initial development.

Status: January 30, 2008 -- CBoot is alpha, Caracal Kernel is early pre-alpha.

Cleese - The goal is an operating system written as much as possible in Python with the Python VM as a micro-kernel on top of a minimal C/asm layer.

Clicker - Exploring new ways in OS design. Clicker32 is a microkernel-based system for x86 hardware. It s based on modular architecture and already supports preemptive multithreading user-level processes. Next milestone 0.8.0 should allow loading of user program from another user program.

COBOS - COBOS is a, currently closed source, 64-bit microkernel based operating system. It is mainly developed for educational purposes.

Coremark - A minimalist kernel providing test environment for hardware performance analysis testing

Contact: Hüseyin Uslu shalafiraistlin NOSPAM gmail dot com

Status: 0, No public release yet -- No public release yet

C-OS - A 16 bit real mode kernel that s based on DOS.

Contact: walking_zombie_35 hotmail.com

URL: none none

Status: -- Sill working on it.

cos2000 - Un OS en fran.ais enti.rment en ASM. Le site traite aussi de la prog des OS.

Crocos - Crocos is a small opensource UNIX-like kernel for x86/x86_64 systems written in C, designed with simplicity in mind, for educational purposes. It is developed in several steps to allow people to understand how a tiny operating system can be built from scratch. The main idea used in early development phases is to run a multiprocesses environment inside one Linux process. This way, it is possible to implement a maximum of features with the comfort of Linux for debugging and tests.

Contact: Guillaume Duranceau g_duranceau A.T users D.O.T sourceforge D.O.T net

Status: -- Crocos is currently a multitasks system embedded inside one Linux process. It supports read operations on an ext2 file system.

Derrick Operating System - A monolithic 32-bit operating system kernel designed for stability and speed. Derrick is running in protected mode. It s coded in x86 assembly and it s aimed as a single-tasking hybrid monolithic OS.

DEX Extensible operating system dex-os - dex-os is an educational operating system that supports a plug-in like architecture and aims to achieve zero static inter-module calls.

DexOS - DexOS is a 32bit, asm OS, based on the idea, that it would be cool to have a OS based on a console type OS, but instead of running on a xbox or DS, it would run on a x86. From the start, as you would expect from a OS based on a game s console OS, optimizing for speed has been of paramount important in the over all design. To this end there s no virtual memory, paging, and only a single process is allowed though that process can spawn multiple threads. The program runs in ring0, you have direct access to all hardware including CPU and graphics. Memory allocation is the responsibility of the app--there s no front-end memory allocation. The entire OS will fit into less than 100k.

Contact: Team Dex4u justdex4u aol.com

DreamOs - Home-made operating system, developed in C and asm for x86 architectures.

DreckigOS - Dreckig is an x86, real mode, multi-tasking kinda operating system written in assembly language. It uses a megalithic kernel, making it very fast.

Dux - Dux started in 2008 is a constantly changing Operating System currently running on i386, using the metodo kernel. It is designed to be clean and easy to work with for developers and users alike, and easy to debug with it s interactive kernel debugger colpa. Access will be divided amongst 4 levels - Kernel Access full access, Kernel Drivers ie, graphics drivers, User Drivers userland, but more syscalls, User Access untrusted. See for more information.

Dynacube Operating System - A Full fledged open source, x86 based, 32bit Protected mode, multitasking operating system. Check it out.

DynatOS - An OS that takes a different and more simplistic approach to abstracting the fundamentals of a computer system. Initially targeting the x86 32-bit processor series, DynatOS now focuses on the x86-64 architecture. The kernel is developed in assembly language using NASM.

Contact: Keith Kanios spook AT dynatos.org

Status: -- Pre-Alpha Development. 64-bit Long Mode. Memory and Process Management. Paging. Software Task Switching. Basic Resource Management. Basic ABI.

EFOS Efficient and Secure Operating System Project - This project is an effort to create an Operating System essentially impervious to security attacks. This is an extrodinary undertaking, requiring multiple levels of effort. The concentration will be on securing the operating system from the ground up, and providing an impenetratable barrier against user mode applications attempting to maliciously alter the system or OS.

Status: -- Alpha

EROS Extremely Reliable Operating System - EROS merges some very old ideas in operating systems with some newer ideas about performance and resource management. The result is a small, secure, real-time operating system that provides orthogonal persistence. - Development had stopped in favour of CapROS.

EmbOS Embedded Operating System - EmbOS aims to provide a basic operating system task manager, basic drivers, memory management and file system support to allow quick easy development of embedded systems in a high level language by allowing the developer to focus on the software portion of the system.

Escape - Escape is a 32-Bit microkernel operating system for X86 that supports multitasking and multithreading. It s implemented in ANSI C, C and a bit assembler and most parts of it are UNIX-like. The goal is to experiment with it and learn as much as possible about operating systems, hardware and so on.

FDOS - FDOS uses only 30K code, but contains every important part and exceeds the well known M DOS in every detail. It does not only work in protected mode, but contains two drivers for floppy and harddisks written from scratch too. A filesystem special for those media is added, which is not only very extentable, but installed in one second.

Contact: Frizzz asmos AT rcfriz.de

Festival - The multimedia operating system.

Status: November 23, 2007 -- An alpha build is available

FlachsOS - FlachsOS is a 32-Bit Realtime Operating System.

Contact: Daniel Wei.ler Xardas and Michael Wangler Wacky michael.wangler AT web.de

Flick - Flick is supposed to be a simple but powerful and clean 32-bit Unix.

Fluidium - Fluidium is a x86 hobby operating system designed to create a user-friendly, text-oriented, computer experience.

Frame - The main design goals were to create the most simple operating system KISS and to learn how to make one. It is written in assembly FASM with custom preprocessor. New website will be available soon.

Contact: Mariusz assassinxp93 AT gmail.com

Status: 24, 2011

FreeDOS - 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, in DOS , and in 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

FreeNOS - FreeNOS Free Niek s Operating System is an experimental microkernel operating system for learning purposes, licensed under the GPLv3.

FritzOS - FritzOS is a incomplete OS. Ideas will be added to the OS as it s developed and, it will run on the x86 platform. FritzOS will have a GUI and be easy to use understand.FritzOS is programmed in Assembly/Intel Syntax, C, and C.

Contact: Tom Fritz jrfritz47 AT hotmail.com

Status: November 24, 2002 -- kernel-prekernel-0.7.1 C CVS empty

FrostOS - FrostOS is an operating system developed by SecurityOverride. The OS aims to deliver a security auditing experience like none other.

Fudge - Fudge is a very basic 32 bit microkernel operating system written in mostly C except for some parts written in Assembler. The goal is to move as much functionality as possible into userspace while still maintaining fast execution times.

GalaXyOS - This is a new OS written in C. We want that this OS is simple to use but highly sure and stable. One has already many as an example utility writer of simple text. It recognizes the frequency of the CPU and the amount of RAM.

Game6 - This kernel is still in the planning stages, but it will be a microkernel. It is written to experiment with microkernels as well as to use as simple code as possible, getting the system working before caring about speed. Game6 is a codename the OS is general purpose.

GeekOS - Earlier versions of GeekOS have been used as the basis for student projects in operating system courses. This new development version of GeekOS is a rewrite designed to address limitations in the original version. It is not specifically designed for course projects, but because it strives for simplicity, it might be useful for people interested in learning about OS kernel implementation.

Gemini - The goal is to create a production quality micro kernel based on the latest findings in operating system research. The result will be a micro-kernel having the following features: no abstractions, safe those necessary for protection, minimal set of primitives, support for capability based security, support for resource management needed for real-time and multimedia applications.

Genius HorizonOS - This OS is made by a schoolboy he was born in 1996 and is a small 32-bit, closed source OS but you still can ask the developer about how did he do that to help you to do the thing that you asking about. It supports FAT12, floppy disks, memory management, keyboard, and it will support graphics soon.

GZistem - A simple 32bits operating system being developed in C

Haiku - 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.

Contact: haiku-development freelists.org

Status: September 13, 2009 -- R1 alpha 1 -- active

HelenOS - Preemptive microkernel design, SMP support, lightweight IPC, thread-local storage and user-space managed fibrils

Contact: helenos-devel lists.modry.cz

Status: June 19, 2007 -- 0.2.0.5 -- active

HeliX - HeliX is a german open-source OS. It has a nice shell and already supports FAT 12, multitasking, keyboards and mice and very, very much more HeliX is still in development and it doesnt exist a long time, so there are many features to come. At this point of time there are no downloads at the webpage, because there are still some heavy bugs ; -please be patient; they ll come.

Horizon - Horizon is a research Operating System. It is written for the i386 processor family, using C gcc and some Assembly nasm. Its main goal is to develop a natively network-integrated structure, so that I/O operations both local and network ones happen in the same manner. This way every Horizon node on the Internet or in a LAN can communicate natively by means of a Network File System.

Hydrogen OS - Hydrogen OS is an operating system for x86-based computers written entirely in assembly language. This is mainly a learning environment for the author. The main goal is just to make a simple and working operating system. This goal is now achieved, but there is still a lot of work to do.

IBOX - IBOX is a modular operating system for the x86 desktop. The main goals of this os are: Portability, Stability, Security, and Customizable. It will be written in assembly language and C. I suggest you take a look for yourself.

Idylla OS - Idylla OS is small and simple operating system. It will be written in assembly language and C. The main goals: Portability, Stability, Security and Customizable.

Infinitech - New project under way. The system is being written in C.

ISOS - ISOS is a very simple multithreaded OS for the Evaluator-7T board from ARM. It is based on JayOS also listed on this page. It features pre-emptive multi-threading, communication between threads, etc. and hardware drivers.

IX - Operating System IX is an x86 64-bit research kernel project that aims to design a kernel for general purpose operating systems including desktops and servers.

JaysOS - JaysOS is a toy OS that runs on the Gameboy Advance. It provides preemptive threads, semaphores, condition variables, and message queues.

Jimix - Jimix is an x86 _64 OS based on a microkernel architecture. It is written in C and all IPC methods are wrapped over a Remote Method Invocation paradigm.

Jinix - Jinix is a closed source operating system built from scratch.

JNode - JNode Java New Operating System Design Effort is an open source java OS written fully in java with a very small assembler nano-kernel.

JonOS - JonOS is a 16-bit operating system made entirely in asm, released under the GNU General Public License. It can t do much yet, but it has a cool prompt and a nice clock ;

Contact: Wojciech Komorowski aka GigaWolf gigawolf AT hotmail.com

JouleOS - Something simple and different; kind of like pie except with 32bits --This is basically a dead project.

JPasKernel - An operating system written in Object Pascal targetting embedded platforms

Contact: jeppe j-software.dk

Kairos - Kairos is a revolution in operating system design: the focus is simplicity, minimalism, and power; doing away with legacy compatibility and restoring optimal timing and throughput efficiency by utilising the full potential of the 64 bit architecture coupled with the modularity and reliability of a modern μKernel.

Contact: Joshua K stable.entropy AT gmail.com

Status: -- Planning Stage

Kid Operating System KOS - A French operating system project. A modular OS, written in C, with an object oriented driver management. Use protected mode. Lots of documentation on the Web site.

Contact: Julien Munier, Thomas Petazzoni, David Decotigny thomas.petazzoni AT enix.org

Kolibri OS - Kolibri OS was a fork of the 32-bit version of Menuet OS but has changed much along the way. The Kernel and most applications, libraries and drivers are written in FASM.

KOS - KOS is a modest OS meant to incorporate purely experimental features.

Contact: Karthik Kumar karthikkumar AT gmail DOT com

Status: -- Kernel has working interrupt handlers. Ongoing is the design process for the Re-entrant memory allocator, Kernel Re-entrancy and Subsystem Re-entrancy.

Kryos - Kryos is an open source hobby/developer Operating System. Kryos has a basic command line interface cli, multitasking, drivers, debugging and basic executable loading, not to mention a lot of other features

L4ka - L4 is an extremely fast microkernel available for x86, ARM, MIPS and other architectures.

Contact: University of Karlsruhe, Germany l4ka AT ira.uka.de

Lemadops OS - Lemadops is my atempt at writing an OS. It s not very advanced but it will be free to download if anyone wants it. I am aiming for a DOS like system.

Leviathan - Leviathan is a micro/modular 64 bit kernel that aims to be used by the general public. It includes

support for my rwfs filesystem which can handle 500 million exabytes of storage.

Logram - Logram is a small operating system fully 64-bit. It uses its own file system FSL, and recognizes the keyboard. It is developed since April 2008. Logram is maintained by a large community of enthusiasts. It is also a site where you can ask questions and talk about your own OS as osdev.org. The site is in french.

Contact: Denis Steckelmacher steckdenis AT yahoo.fr

Status: -- v0.0.7.5 : File system, memory, extensions, syscalls, keyboard

It seems that Logram is no longer an OS, but a Linux distribution.

LUnix - LNG is an operationg system primarly for the good old Commodore64 home-computer. There also is a native version for the successor Commodore 128. Ports to other 6502/6510 driven 8-Bit Computers are possible but not yet started. LUnix started in 1993 and reached the internet in 1994. In 1997 LUnix 0.1 was rewritten from scratch, the result is LNG.

M3 - M3 is an operating system targeting the IA32 architecture. It is currently under development. The goal for this project is to learn the ins and outs of OS development, and share this knowledge by writing tutorials and well-commented code.

Mammoth OS - Mammoth OS is a compact, lightweight kernel designed to have a monolithic core, and a modular kernel extension system. We hope to have a full implementation of a C compiler toolchain, and other languages such as C and Assembly by Augest 2009.

Contact: callum at rohedin.co.uk

Status: February 18, 2009 -- Version 0.0.2. Still very basic pre-alpha. Implemented proper I/O functions. Next release: Advanced Output, Memory Manager.

ManRiX - ManRiX OS is open source microkernel based operating system with POSIX compliance.ManRiX OS is written totally from scratch using C and Assembly language.

Mattise - Mattise is a very simple hobby operating system for x86 architectures. It is a monolithic kernel written completely in C and assembly with paging, ELF loading modules and executables and a working Newlib port. It has a rudimentary shell and a working nasm and binutils port.

Contact: Matthew Iselin pcmattman AT users.sourceforge.net

Status: April 1, 2007 -- basic C-only version of the kernel, without paging or newlib; basic binary file loader

MazzanetOS - MazzanetOS is a DOS/UNIX-like operating system written in assembly language and C. It currently runs off a floppy disk and includes a graphics demo. It will run hopefully on any PC.

Media OS - Media OS is a secure, microkernel paradigm, 64bit multiprocessor, preemptive multitasking, operating system designed with future technology in mind to take full advantage of hardware. At this point it is non functional, but a CVS exists for it if you would like to take part.

Melon - Melon is a C operating system designed to be simple and fast and to provide a coherent OO framework for developing applications.

MenuetOS - MenuetOS is a fully 32 bit assembly written graphical operating system. Menuet supports 32 bit x86 assembly programming as a faster and smaller system footprint. Menuet has no unix roots and the basic system is meant to be a clean asm based structure. Menuet isn t based in any particular operating system, since the idea has been to remove the extra layers between different parts of software, which complicate programming and create bugs. Menuet s application structure is not specifically reserved for asm programming since the header can be produced with practically any other language. However, the overall application programming design is intended for easy 32 bit asm programming. The GUI is extremely easy to handle with assembly language.

Mettā - Mettā is a social, mobile, multimedia OS. The goal is to be the backbone of social interactions for users in post-internet era, through chaos management. Written in C for multiple architectures.

Contact: Berkus berkus AT exquance.com

Status: -- Running release snapshots available at the site. Still in infancy though.

Micro OS X - A Free DOS like Operating System which fits on one floppy disk. The new Micro OS X is the third generation of Micro OS. The Micro OS X Workspace Manager is based on GEM Desktop.

Contact: Bj.rn Schnackenbeck megadriveag AT yahoo.de

WARNING. This URL Website is not in English.

MIK - A hobbyist 32-bit x86 OS coded completely in pure assembly. Goals are a fully capable operating system with paging/multitasking/FDD, HDD and USB support.

Contact: Pascal Smit smitpascal AT gmail DOT com

Status: -- Not Yet Releasd

MikeOS - A hobbyist 16-bit x86 OS with rudimentary DOS compatibility that boots from a single floppy disk.

Mini Operating System - a 21st Century Operating System ; easy to use ; written in a Java dialect called Turk/2 designed to be more robust than standard Java; all program operations can be done with direct manipulation WIMP ; portable to all CPUs.

Minirighi - A didactic Linux-like kernel.

Mojo OS - Mojo OS aims to be a modern desktop operating system. Ity is currently under active development but far from finished. Read much more on the homepage.

Mona OS - Mona OS is a small, new and fast microkernel system written in C for Intel x86 architecture. It is neither a POSIX or Windows clone.

MOS - Mother Operating System – An operating system designed and developed in C/C to work on x86 alike processor. It is a 32 bit protected mode OS using x86 architectural features for memory management paging, segmentation and process management TSS, Call Gates, Interrupt Gates. Aim is to build a minimal complete packaged OS with support for USB, Internet wifi and a cool GUI - and make it suitable for tablet pcs/netbooks/mobiles.

MSB-OS - An OS originally designed as a platform for my own A.I. work linguistics, but soon to be used for education purposes as well. All programming of MSB-OS has been done directly in machine code without using assembler.

MuOS - Little 32-bit OS with continous development and with good documentation.

MVS/380 - IBM s old IBM mainframe operating system MVS was public domain. With a freely available IBM hardware emulator available, this operating system was dusted off and being given a new life with some radical architecture changes. There s a similar VM/380 available too, for another IBM mainframe OS.

Contact: Paul Edwards fight.subjugation gmail.com

Status: -- Version 1.0 released and a group of people driving it forward on a daily basis instead of being a one-man project

MyNOS - The MyNOS project aims at developing a new and different operating system, based on high-level languages. MyNOS will be based on the OCaml bytecode interpreter. We d like to explore microkernel architecture and new language definition too.

MyOS - MyOS is a free operating system for x86 and mips, coded in C with elf, vesa, ata and ext2 supports.

MysteriOS - Extremely modular monolithic kernel just like Linux but much more modular designed to be potentially portable on almost any platform

Contact: Pierre Krieger webmaster AT tomaka17.com

Status: -- No release for PC, only for GameBoy Advance. Current build 05/2009 has a graphic GUI and can run small native Linux programs ie. a binary working on Linux could work on MysteriOS without recompiling it

MysticOS - MysticOS is an exokernel based OS. Its main goal is to be able to adapt to the users wishes and abilities at run time, providing the perfect environment for anybody. Current features include FreeBasic support and hardware accelerated graphics 2D and 3D.

Contact: Marcel Sondaar marcel_willem AT hotmail.com

Status: 2009 -- The OS is currently pre-alpha - there are no official releases yet. However, nightly builds, source code and documentation are available.

MyXomycota - MyXomycota is a monolithic system running in protected mode and using paging. It is written in C, newlib a small stdlibc is partly ported. It runs from a floppy disk loaded with BIOS interrupts on startup, hence even USB floppy disk drives are supported. I am sorry but many texts are German.

Contact: Max Reitz xanclic googlemail.com

Status: April 4, 2009 -- Kernel with programs running in user mode simple shell, brainfuck compiler, simple editor cedit, standard programs ls, cp, rm, cd, echo, file, top, mount and some ported programs aargh interpreter, flat assembler 1.67.26, ed. -- 0.003 pre alpha

Naked Lady - An open source minimal base operating system, suitable for installation on an IBM compatible computer fitted with a IA32 compatible processor.

Nanos - Nanos is a protected mode nanokernel OS for x86 computers. It is written in assembly and assembled with NASM.

Contact: Peter Hultqvist email at peter.h endnode.se.

Status: -- Bootable kernel, no futher work will be done.

Nano Os - Nano Os is a Hobby/Educational Operating System Project.

It is a monolithic kernel OS for PC and compatibles with 386 and above. It is written in g and assembly NASM

Contact: Ashok Shankar Das ashok dot s dot das at gmail dot com

Status: -- 2 and half years spare time development, Protected mode, Memory Manager, Shell, Basic multi Tasking

NDK - NDK is neuraldk s ongoing experimentation at creating a new, modern operating system. Currently in its infancy, it s of little use to anyone but the beginning operating systems developer.

Neptune Operating System - Neptune is a self hosting 32 bit highly modular graphical multitasking operating system written in C and some assembly.

Contact: See website.

NukeOS - NukeOS is a hobby OS, currently being written in C and Assembly

Contact: charlie ricchio.com

URL: None yet 3 None yet 3

Status: -- Not even past the bootloader stage D

Oberon System - The Oberon System is an academic operating system which was developed by Niklaus Wirth and Jürg Gutknecht in the second half of the 1980s. It is available from ETH Zürich and a more current multiprocessor version can be found here: BlueBottle see also A2. Note that some stuff on these pages appear outdated, but this may be more a problem of keeping the Web-pages as current as the System. An active mailing list is here: Oberon Mailing List Archive. More current and in depth documentation is included in the systems, although you sorrily have to master their partially unconventional user-interface before you can access the documentation. Many dead links in Native Oberon reference site can be reanimated by replacing www with www-old.

Ophiophagus - Going to be implemented as a half-dozen or so user-mode processes on top of an L4 fiasco.OC microkernel. Will include mutual monitoring to check if any of the core processes have hung, deadlocked, or crashed. Hopefully will be made open source under the GPLv3. Likely to be written in C and Lua. Note: I am not currently looking for assistance in development. More complete information can be found at User:Ahferroin7

Contact: Austin S. Hemmelgarn ahferroin7 AT gmail DOT com

URL: None None

Status: -- Pre-Pre-Alpha, currently in planning stage

ominOS - ominOS is a small lightweight kernel that aims to be simple to and have easy to understand source code to learn from. Its definitely not doing anything revolutionary, but I love working on it and seeing where it goes. Currently the os has ports of Nasm, binutils, and some graphic libraries. Also has a partially implemented TCP/IP stack.

Onem OS - Onem OS is an x86-16 assembly kernel. The goal is to be able to run it off of a usb thumb drive.

Orange OS - The Orange OS Project started with the intent to design a lightweight Operating System. It contains a small kernel designed for those interested in the low-level, practical aspects of building an x86 system. Currently, it is designed to fit on a floppy.

OS/C - OS/C is my small, open-source, Unix-like OS. It is and was designed to preform networking tasks and other file-oriented processes whiltaking up very little of the computer s processing power.

Osiris - A modular OS written in C/Assembly. Grub used as the boot loader. Paging, Multi threading, basic vesa mode GUI. Dynamic ELF support, Small C Library Safe String, Math, IO, Mem. Grub loads the Hal which in turn loads the Kernel and other OS Services. Currently working on a USB stack, MP support, NIC Drivers, reworking the GUI system.

OS-periment The - This project aims at cleaning up the mess that desktop OSs have become, going back to a simple, lean and evolutive state. It also tries to be an OS which is solely optimized for use on personal computers from the ground up, like BeOS was, and unlike OSs like the Windows NT family or most Unices which try to address many other, sometimes conflicting needs like those of company servers. Finally, it aims at improving the quality of the everyday desktop user experience through increased reliability, better consistency in the user interface, simpler interaction models, lower annoyance

OSSO - A Micro Kernel Operating System written from scratch

Oxygen Kernel - Graphical microkernel designed for portability and modern systems.

Particle OS - Particle OS is a 32-bit operating system. Visit the website for more information.

Patricknet - Patricknet is an OS Operating System which is not another Linux kernel. Patricknet at this stage uses Grub and is built using NASM, C, GCC. The code is always available. If you want to help with the development proccess please feel free to e-mail.

PDOS - Public Domain Operating System - One of very few operating systems that have an explicit released to the public domain notice. What that means is that if you spend time on this, and you later see a commercial use for it, there is absolutely no restriction on selling/modifying etc, any more than you would dig up Shakespeare and ask him if it s OK to use Hamlet. It is designed to look like MSDOS, and can currently execute some MSDOS executables unchanged. It s written in C, with some assembler, and a 32-bit version, that also looks like MSDOS, but isn t, is included.

Contact: Paul Edwards - main author: fight.subjugation gmail.com

Status: -- PDOS 0.86 is sufficiently complete to allow some commercial tasks to be theoretically possible. -- Current activity is restricted to the C runtime library that it is operates with, rather than the OS itself.

Pebble Operating System - Pebble is a 32-bit operating sytem for IA-32 systems. It can run MS-DOS and DPMI compatible applications and will provide advanced features such as multitasking and paging. It will be a good platform to run old MS-DOS and embedded programs.

Contact:

Pedigree - Monolithic OS under development by JamesM, bluecode and pcmattman. Bringing several backends up simulaneously - x86, x64, MIPS32, ARM and PowerPC. Kernel written in C with the obvious bits of ASM.

Pépin - A small and simple kernel created for educational purposes. A great care is put on keeping the code as simple and clear as possible. The project home page provide a full tutorial currently only in french explaining how to code a kernel using a bottom-up approach. Pépin is written in C and some i386 assembly. Support : Grub, 32bit Protected mode, Interrupts, Segmentation, Paging, Syscalls, Multi-tasking, IDE PIO mode, Ext2FS read, ELF, Signals. Every stuff released under GNU GPL and GNU FDL terms.

Perception - A native 64-bit operating system built around a microkernel. Better website coming soon.

Contact: MessiahAndrw.

URL: - -

Plan 9 - Plan 9 is a distributed system built by Bell Laboratories now Alcatel-Lucent, the same group that developed Unix, C, and C. it uses three kinds of components: terminals that sit on users desks, file servers that store permanent data, and other servers that provide faster CPUs, user authentication, and network gateways. In typical use, users interact with applications that run either on their terminals or on CPU servers, and the applications get their data from the file servers. The CD image is built every night from the latest source and also work as a live CD. There is a Plan 9 Wiki.

POS - Peter Operating System is my os research project started in year two in university 1998.

POSYS - POSYS: Programmers Operating SYStem Small, fast, dynamic, secure. In development Language: NASM CC386. Useful links on page.

Prex - The Prex project is an open source initiative to provide a portable real-time operating system for embedded systems.

Pro-OS - A 32-Bit OS for the x86. A microkernel architecture targetted for speed.

Pure64 - Pure64 is a second stage bootloader for 64-bit PC s with compatible Intel or AMD processors. The loader gets the computer into a full 64-bit state with no legacy compatibility layers. Pure64 also enables and configures all available Cores/CPUs in the computer. An information table is stored in memory after Pure64 is finished that stores important details about the computer.

Quark Operating System - Quark is an Object Oriented 32 bit operating system. It aims to be a complete multitasking kernel.

QUARN - OS project in assembler and C. System works in 32bit Protected Mode, with multitasking and multithreading. There is also ELF attendance and dynamic linker. Quarn OS has drivers for FDC, PIT, RTC, serial port, keyboard, VGA text mode, PCI bus and many more. It also provides tool that allow to configure it, possibilities are very wide. For example you can chose if you want it to run with full preemption, user-space preemption or without preemption. Quarn OS also has special Artificial Intelligence module that is used in scheduler, but there are plans to use it in many more ways.

RDOS - x86 based OS written entirely in assembly. Provides protection with segmentation and paging. Has drivers for FAT-based file systems, TCP/IP, USB, sound, LFB based VESA support with a GUI API. The user-level API is based on C classes.

Contact: Leif Ekblad leif AT rdos.net

Status: -- Stable, used for some commercial projects.

Reactos - A GPL project to clone WinNT written from scratch. It runs: Firefox, OpenOffice 2,Quake III Arena, and much more. A lot of work is still need to be done. Looking for developers.

Contact: a team of developers ros-general AT reactos.com

Status: -- 0.3.13 - Alpha Stage Not recommended for everyday use

RedOS - RedOS is a small operating system written in C, assembly it work on PM32, Just come to see.

Rhombus - Rhombus is a microkernel-based operating system written in C for protected mode x86. It currently contains a kernel, drivers, shell utilities, and a C library, all written from scratch. It has a distributed VFS mechanism, a human-readable/writable remote procedure call protocol, and some other neat features. It is roughly UNIX-like, but with some major architectural differences. It is distributed under an OpenBSD-style license. It has been under pretty active development for the last three years, and is nearing a public alpha/beta release.

RMMTOS - Real Mode Multitasking Operating System

RMoX - A highly concurrent OS written mostly in the occam-pi parallel programming language. The OS is designed and built from large numbers of small concurrent processes that are cooperatively scheduled and communicate via synchronous channels. Currently only targets x86 based systems 586 and up with embedded platforms PC/104 and PC/104plus in mind.

Contact: Fred Barnes F.R.M.Barnes AT kent.ac.uk

Status: -- experimental but functional

Ruby Operating System - Harvest the best features from other operating systems and combine it into ROS. ROS should be user friendly. As much as possible should be written in Ruby, so that a user, which masters Ruby, are in full control of ROS.

RYMOS - Graphic os under construction maked with NASM and GCC

Contact: Roberto Rodriguez romyt01 AT yahoo.es

Website down

Saerox - An OS meant to be extremely stable and use resources efficiently. It is currently in development and will run on Intel x86. Written in assembly and C. It is not commercial yet, so help is greatly appreciated.

Contact: Jason Prince jason.prince saerox.com

sanos - A small 32-bit x86 operating system kernel for jbox appliances. A jbox is a JavaOS server appliance running on standard PC hardware. This enables you to run java server applications without the need to install a host operating system. Only a standard Java HotSpot VM and the sanos kernel are needed.

Contact: Michael Ringgaard mri AT jbox.dk

Sartoris Microkernel - The Sartoris Project aim is to develop a portable microkernel and a set of operating system services that support: - Efficient implementation of local system calls. - Concurrent execution of several OS personalities, ie a UNIX environment and a native microkernel-based interface. - Simple and elegant integration of distributed operating system components.

SauOS - SauOS is a 32-bit protected mode kernel written in C. It was initially based on bkerndev but is now being rewritten in a branch.

Contact: imate900 asteinborn SeventyEight AT Gmail DOT com

Status: -- At present the kernel is being rewritten

ScorchOS - A 32-bit pmode OS aimed to be light-weight, fast, well-documented and easy to develop.

Sea Kernel - A small kernel by Piranha that will be similar to Linux, but not a clone. It has multitasking, usermode, MM, and various other lower functions. Also, basic mouse, HDD, FDD, support, and ext2 support as well. I will also work out AI at the lower level maybe. A hobby OS would discribe it well.

SharpOS - SharpOS is the original open source effort to write an operating system in 100 C, with a strong focus on security, reliability, and maintainability. It has a wiki.

Shunya Operating System - The project Shunya explores the fundamentals of Operating Systems and deals with creating a simple OS which can be loaded by a Multiboot Compliant Bootloader. Though it can t be called a complete OS as it just provides a bare platform for further development but it utilizes a C Library and other Memory Management Tasks.

SkyOS V3.0 - 32Bit PM, Paging, Multitasking, VM86, GUI SkyGI/GiGFX, VFS,FAT12/16/32,SkyFS,ProcFS,DeviceFS,Network,TCP/IP,Keyboard, Serial,PS/2,IDE,ATAPI,FDD,RAMDISK,Soundblaster,VESA2.0,CT6xxxx, Dynamic loadlable modules, PnP, PCI, LIBC, SkyGI Library, Graphical Applications.

Contact: Szeleney Robert Robert.Szeleney AT br-automation.co.at

smiddyOS - smiddyOS is an operating system that is written in FASM asm. It is mainly a learning environment for the author, with pretty loose goals.

Solar_OS - Simple, easy, fast 32bit GUI OS in ASM

Contact: bogdan_ontanu yahoo -- insert the dot here remove under score in name -- com

SollerOS - A unix-based 32 bit operating system written in assembly-it has no connection to Solar_OS, the similar names are just a coincidence

spiderpig - 32 bit operating system written in C

SubraX - Educational/Experimental Operating System with graphical interface support under Oracle VirtualBox. Whilst not yet usable it is growing relatively fast.

Contact: bobbyjo AT love2code.org

Status: -- As of February 2011, my a remote server automatically builds nightly and uploads to sourceforge mirrors weekly. Typically a change is made weekly.

Sugatha RTOS kernel - Sugatha is an RTOS kernel with upto 8 priority levels. It is mainly written in C with the CPU specific code in asm.

SUNUX - SUNUX is aiming to be an networking OS for running web servers and DHCP server, etc.

Sunlight - Sunlight is a 32-bit protected mode OS written from scratch. Planned to make a simple GUI.

Contact: qandrew qandrew777 AT yahoo.com

Status: -- Full system rewrite v0.0.114 24.12.2009

SyCODE Platform - SyCODE Platform is not yet but will be a 32bit pmode OS multitasking with GUI. The executable format will probably the PE. I will port an assembler, a C compiler, a linker, and I will port a basic compiler I am writing it for DOS, it will support many features ported from C language.

Synergy OS - Synergy OS is an operating system built for learning purposes. It s built from the ground up using only assembly and no C; nasm and GNU ld are required to build it. It currently has a 32 bit protected mode kernel and a keyboard driver. It s source is in the OS download

SysPak OS - SyaPak OS is a microkernel based multiprocessor, multitasking, multithreading operating system for the IBM-PC Intel i386 systems. It is developed in Department of Computer Science of Bahahuddin Zakariya University, Multan Pakistan, under the kind supervision of Dr. Aman Ullah Khan. SysPak OS is a operating system with an emphasis on design and portability. It is largely implemented in C/C, with a small amount of assembly. Currently, the system is mostly a kernel with a minimal amount of user space libraries and applications. Thus far, most of the work has been put into the kernel and other underlying support. As a result the system isn t that interesting from an end-user point of view no gui, simple commands on a command line. Full documentation is available.

Tabos - Tabos is a new operating system, at this stage of development aimed to run on intel s x86 platform. Although it is our first try in creating a runable, modern os, it seems that we are on the right way. We decided to develop a modular monolithic kernel with module loading support, using the x86 platform features to achieve this goal

tachyon - tachyon is another hobby OS, longing to support x86 and x86_64. currently, it boots on both platforms in qemu, bochs, virtualbox and real hardware. it has not much to see, really, but a working physical and virtual memory managment still improving

TappiOS - A personal pet project for learning basics of OS developement; creating everything from scratch from boot up including bootloader, file system, binary format, etc. The long term plan is to create a pure long mode microkernel operating system for fun an enjoyment.

TempOS - TempOS is an educational and multi purpose Operating System that was born as an undergraduate work and has it s your main goal to be not only another Operating System, but a complete toolkit designed to help students on their O.S. courses.

Contact: Renê S. Pinto rene AT renesp.com.br

Status: -- In active development early stage

The Damn Small OS - An Exo-kernel where the application builds the system it self, providing the most basical functions for a multi-tasking system. All the response is thrown to the application, let it manage, but protecting the resources. An extreme approach of Operating Systems, that should be highly portable. 100 in C.

the dr - It s a kernel for the IA32 architecture written in C and asm. It s based on the exokernel architecture but forks from it when simplicity can be gained.

The Spoon Microkernel - The spoon microkernel is my hobby. It s becoming a fully stocked microkernel and an operating system is being built around it. Please enjoy having a look, it s great for people to learn from.

Titanium Bonfire Operating System/32 TBOS32 - TBOS32 is a flexible 32-bit x86 OS written in C with NASM and based on early parts of JamesM s tutorials.

TJI-OS - TJI-OS is a 32bit Operating System, i have decided to create. I have had much experience in Basic, HTML, Batch. I will have to learn C or C to create this OS but i think it will be an interesting chalenge. Any ideas/ feedback let me know.

Contact: Ian icisted AT yahoo.co.uk

Tornado - The modular kernel.

Trion - A portable nanokernel-based OS.

týndur - The microkernel-based community OS of the German OS development community Lowlevel.

Tysos - The type-safe operating system is a 64-bit multitasking microkernel written in C

Contact: John Cronin jncronin AT tysos.org

Status: -- Ahead-of-time compiler is mostly complete, work has switched to implementing the kernel

U-OS - A German OS Project

Contact: Jan Loebel jan.loebel AT web.de

Status: -- 2005: Project was stopped

UbixOS - It s Back :

UNEXT/os aka You Next /Operating System v8.1.b c 2009 - c flat mode operating system by a.T.d

current features:

flat mode memory module up to 4gig s of RAM

fat 12,16,32 driver

ps2 mouse driver

multi tasking

as usual CLI is supported

XGUI open desktop : VBE2,800x600x256 and more, windowing system, buildin script language for GUI application development Basic like language

support 40 of DOS API aka int 0x20,0x21,0x33

Contact: r_ed209 AT yahoo DOT CoM

URL: coming soon i hope coming soon i hope

Status: -- 60 done

Useless OS - The Useless OS is made entirely in ASM compiled with NASM. It is currently a 16 bit Real-Mode OS with a FAT12 filesystem. It has around 30 system calls and an ASM header for developing applications for the UOS. Applications can be developed in ASM, or with a BASIC compiler called UBASIC Useless BASIC that was programmed in FreeBASIC. The UBASIC Compiler takes BASIC code and translates it to NASM code which in turn compiles it to flat-binary or. COM applications. The way the UOS multi-tasks is more like task switching in real-mode. A GUI is currently being developed. Future plans are to write a 32 bit p-mode extender, then port the GUI to use it for better multi-tasking. Note that our website is under construction.

Valix - The Valix Operating System is a managed-code operating system. Valix runs no userland binaries: instead, an object-oriented interpreter is built into the kernel. This offers superior security the only binary the CPU is directly running is the kernel itself and faster speeds compared to other interpreters, since time is not wasted with context switching between kernelmode and usermode. Valix itself is written in GCC C, C, and FASM Assembly under GPLv3; source code available at x86 architecture. Example of interpreted code at code_examples

Contact: xvedejas and cfaust at valix on irc.freenode.net, or xvedejas gmail.com

Status: 2009, 2010, 2011

VolTroX Operating System - Codenames Chronos And Aurora, Two 16bit real mode operating systems developed by two teams Aurora And Chronos, They are both fat12 compatable, and will contain vesa gui, with simple memory management

VSTa - VSTa is a copylefted system, originally written by Andrew Valencia, which uses ideas from several research operating systems in its implementation. It attempts to be POSIXish except where POSIX gets in the way, and runs on a number of different PC configurations. VSTa is also designed to take advantage of SMP right out of the box.

WISDOM - WISDOM is a 32-bit operating system with a primitive shell implemented. It is copyrighted under GNU/GPL license. WISDOM is also a research into the field of design of operating system.

XOmB - General purpose OS built on top of the XOmB exokernel. Aims to do away with the legacy crap of x86 and utilize the features of x86_64 to their benefit. Devices as given to the user with the most minimal of abstractions. The kernel itself is multicore 64 bit only. It supports multicore scheduling, a userspace keyboard driver, a userspace VESA driver through x86 emulation, and is actively developed by a group of undergraduate and graduate students.

X-OS - French OS Project

Contact: AlAdDiN

WARNING. The website is down

Xenon - Xenon is almost a UNIX clone; I am not yet sure how it will be different, but there will be something :- It aims to be small and fairly fast, but mostly it only exists to fill my time At this point, the only fully working component is the crash handler. It is currently in C/NASM. License: MIT

Xenon - Xenon is a completely new breed of operating system inspired by Singularity, L4, Panda, and Vista. It combines software isolated tasks using type-safe code C with a completely kernel free design that replaces the traditional kernel with a group of core services running in their own tasks. This design provides the best stability and security while improving performance. Xenon Software is my startup company that strives to think nowhere near the box.

Xero MaLux - Xero MaLux, or MLX for short, is an operating system which is completely based on nothing. The aim is simple. Strive for efficiency in its purest form. It is written in C, later to be ported, and entirely developed, in ASM.

Contact: connorwood71 at googlemail dot com

Status: -- Graphics, and basic Memory Manager working. Quasi-window manager.

Zephirum OS - An interpreted OS from v0.0.2 with extreme security. Originally it was aimed at being a POSIX compliant system, now it is no longer a unix based OS. Can perform parallel processing. Written in x86_64 assembly.

ZoftOS - ZoftOS is a Intel 80x86 based OS that will subject to change provide support for VFAT and ext2 with different executable file formats supported. Written in C/C gcc and assembly nasm, unde Win/DOS using Bochs for testing anyways. Main purpose __was__ to develop a smarter shell, that could recognize and learn different commands and shell scripting that s more flexible.

Contact: Ben Hsu ben.sunghsu AT att.net

Status.

Kernel threads are used to implement background tasks inside the kernel. They are similar to user processes, but live in kernel address space.
Summary of the changes and new features merged in the Linux kernel during the 3.10 development cycle.
Dec 23, 2015 Acess2. Acess2 is a kernel and operating system designed to do what Linux does, be customizable to any given situation. However, unlike Linux, it there is.
The Linux kernel is a monolithic kernel, supporting true preemptive multitasking both in user mode and, since the 2.6 series, in kernel mode 55 56, virtual.
Acronym: Meaning: AMC Advanced Mezzanine Card CCS Texas Instruments Code Composer Studio CSL Texas Instruments Chip Support Library DDR Double Data Rate.

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