Relocated here from OperatingSystemDesigners
There are a large number of aspiring amateur Operating System implementers on the web today, a handful of whom have actually produced working and even innovative systems. There are several discussion boards on the topic, some of which are quite sophisticated.
Operating System Projects:
News and Discussion sites:
Moved from OperatingSystemsResearch
The Linux Assembly HOWTO by Konstantin Boldyshev and Francois-Rene Rideau has a section specifically on creating a OS : http://tldp.org/HOWTO/Assembly-HOWTO/ownos.html
Create your own Operating System FAQ by Stuart 'Dark Fiber' George : http://mega-tokyo.com/os/os-faq.html
Y.O.S. - Your Operating System : http://sourceforge.net/projects/yos/
The operating system developers homepage, "for the developers of alternative operating systems" : http://www.500mhz.net/
Kernprof (Kernel Profiling) : http://oss.sgi.com/projects/kernprof/