The Operating System Developers Homepage  
   Index of operating systems and links to resources for programmers.
   http://www.500mhz.net/

Virtual Memory Tutorial  
   Extensive discussion of virtual memory.
   http://cne.gmu.edu/modules/vm/

Inter-Process Communication Tutorial  
   Interactive tutorial about message passing, semaphores, and monitors.
   http://cne.gmu.edu/modules/ipc/

KernelNewbies.org  
   Resources for programmers new to kernel hacking. Example code, FAQs, utilities for debugging modules.
   http://kernelnewbies.org/

Bootstrap Tutorial  
   How to write a bootstrapper.
   http://www.geocities.com/mvea/bootstrap.htm

Write Your Own Operating System [FAQ]  
   The Hobbyist guide to writing your own operating system from the ground up, Question and Answer style on everything from PMode to filesystems to GCC and doing it in C++.
   http://www.mega-tokyo.com/os/os-faq.html

KernelCode  
   News and reviews of kernels.
   http://www.kernelcode.com/

DBLP Bibliography: Operating Systems  
   Links to many operating systems journals on the web.
   http://www.informatik.uni-trier.de/~ley/db/os.html

Therx OS Development Library  
   A site containing archived documents relating to the programming of Operating Systems.
   http://xinit.port5.com/

The OSKit Project  
   An open source set of libraries that can be used as building blocks for an operating system for x86. Includes documentation and publications.
   http://www.cs.utah.edu/flux/oskit/

ACM Special Interest Group for Operating Systems  
   Tutorial for writing an operating system and links to group members' projects.
   http://www.acm.uiuc.edu/sigops/

The Operating Systems Resource Center  
   Extensive information about booting, file systems, memory, architecture, and interfacing with other devices.
   http://www.nondot.org/sabre/os/articles

Operating Systems and System Software  
   Contains sources of a minimal kernel, a new CPU scheduler for Linux, multithreading in Linux, systems software in DOS and collection of good reference material for OS lovers.
   http://www.angelfire.com/myband/unix/os.htm

CS 3210 Design of Operating Systems  
   A course in operating systems with a focus on the design and construction of a modern OS kernel.
   http://www.cc.gatech.edu/classes/AY2000/cs3210_spring/

JOSH - Operating Systems Development Tutorial  
   Tutorial on operating system development leading to the development of a real mode single tasking operating system developed in assembler.
   http://www.ansanest.com/josh/

Groovyweb: Operating system programming  
   An open source os written in Turbo C (for DOS/ windows) and nasm (Windows/Dos/Linux) as well as two exclusive tutorials on how to write an operating system.
   http://www.groovyweb.uklinux.net/index.php?page_name=Operating%20system%20programming

Triple Fault Club  
   Information on writing your own operating system, protected mode, and small independent OS projects with freely-available source code.
   http://my.execpc.com/CE/AC/geezer/os/

Tony Macs Programming Pages  
   Focuses on x86 programming and includes links to other good sites, including MenuetOS. Collection of OS screenshots.
   http://www.tonymac20.freeservers.com/

Ace Operating System Project  
   An open source operating system for X86 architecture. It also contains documents, specifications explaning various hardware.
   http://aceos.netfirms.com/

LusitanOS  
   Open source operating system, planned to be an OS entirely made by Portuguese people and built mainly as a way of self-learning and research on operating systems development. [Open source]
   http://lusitanos.sourceforge.net/

Triada  
   Ukrainiann Operating System. OS sources, toolkit downloads. OS development related articles.
   http://www.triadaos.narod.ru/

Xosdev OS Development Central  
   Directory of OS development related resources.
   http://xosdev.port5.com/

DXOS  
   Developed by Richard Hayden, also containing information on low-level systems and operating system programming, forums.
   http://dx-dev.qubit.org.uk/en/dxos/default.asp

Yet Another Object Oriented Operating System  
   A project of developing new object oriented operating system.
   http://yaooos.org/

Operating System Lecture Notes  
   Notes on operating system theory, source code of describing actual construction of operating system in C programming language. Also OS construction related links to books, notes, tutorials, and news groups.
   http://www.personal.kent.edu/~rmuhamma/OpSystems/os.html

WJS Home Page  
   Memory allocation and multitasking algorithms. Programming Interrupts for DOS (docs and examples). Devices programming (PIC, PIT, FDC, IDE, KEYBOARD) source code and links. Utilities.
   http://www.codigo.hostmidia.com.br

Introduction to Operating Systems and Systems Programming  
   Course details and material.
   http://www.narora.net/teaching/cosc1112_1114/

Operating System Index  
   A list of educational and experimental operating systems aiming to help developers who are looking for code examples.
   http://backster.free.fr

Tuomo Kortesmaa  
   Notes and example code for basic operating systems concepts, threads, sockets, and device drivers.
   http://users.evitech.fi/~tk/

Bona Fide OS Development  
   OS development information and tutorials. Links.
   http://www.osdever.net/

Home Page of LA Sewell  
   Bootsi - a simple program (Windows) write a bootsector to a floppy disk; a.zip - a floppy disk image for use with Bochs a PC emulator, contains a bootsector written by John Fine which loads a program called LOADER.BIN (also on the image), and also contain
   http://members.lycos.co.uk/lasewell/

OSDEV Community  
   A web portal dedicated to operating system development, attracting programmers into an advanced development environment.
   http://www.osdcom.info/

Cottontail OS Development Library  
   Old non-updated mirror online library covering a plethora of OS development topics. Datasheets, tutorials, reference manuals and hardware programming information.
   http://www.microbrainz.com/os/oslib/oslib-1.02/

Pierre's Library  
   A resource center for PC operating system developpers. The aim is to provide reliable documents about software and hardware standards under the aspect of official specifications as well as more friendly documents.
   http://perso.wanadoo.fr/pierrelib/