I am starting my OS project and that is to install as many operating systems as possible. This week I installed Ubuntu 6.06 (Dapper Drake) on my PowerBook PPC Mac G4. Now I only have 2 OS on my computer; Mac OS X Leopard and Linux. I hope to get the HP 2133 Mini Note and use it to test as many OSes as possible. Below are some great links about Operating Systems.
FreeOS.com The Resource Center for Free Operating Systems
Freebyte’s Guide to Free and non-Free Operating Systems
OS History list of operating systems
Vintage Operating Systems
Ubuntu Forums “Are there any OSes not based on unix that are open-sourced?