OSDev.org

Here is a list of OSes with open source. if everyone writes some example OSes with open source, it will make all our job simpler. Example code is everytime helps better.

Here is my list. Please everyone add theirs.

ReactOS
LittleOS
PizzyOS
PollyOS
Minix

A simple google search will give their homepage and sources can be downloaded easly.

Why aren't the free BSDs or Linux on this list?
Linux source at least is quite clean and easy to read..

yes. you are right.

and somethers:
glukos
pizzios(not pizzyos)
leeos
cosmos
jeffos
skyos

Menuetos
www.menuetos.org

Bye