TAJ Operating System
TAJ Operating System is developed in C++ by Viral Patel. Taj OS is a multiuser, multitask and multithreaded operating system.
http://www.viralpatel.net/taj/home.php

Retrospective in Operating System Arts
Documentations on how to get various operating systems running inside Hercules.
http://open360.copyleft.de/

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

Tri-Motion Industries Inc.
Tri-Motion Industries provide air hoists and balancing machines to simplify large tasks.
http://www.trimotionindustries.com

Shaner Consultants
Professional technical consulting corporation specializing in mainframe and UNIX operating systems performing operating system installations, upgrades, problem resolution and project management.
http://www.shanerconsultants.com/

ACM Special Interest Group for Operating Systems
Special Interest Group for Operating Systems
http://www.acm.uiuc.edu/sigops/

MasterBooter
Boot manager which can be used to install and maintain operating systems on a PC. Supports many operating systems. Shareware and registered versions available.
http://www.masterbooter.com/

MkLinux
This is the official site for MkLinux, a port of Linux to the Power Macintosh, running Linux 2.0.xx on the OSF Mach 3 MicroKernel. This was originally a project by Apple Computer, Inc. and the Open Software Foundation.
http://www.mklinux.org/

Ace Operating System Project
Ace OS - Home - Open Source Operating System for Intel X86 Architecture.
http://www.samueldotj.com/Ace/

Operating System Sucks-Rules-O-Meter
The operating system quality and approval metric
http://srom.zgp.org/