Hello:
Here is a list of some interesting open source operating systems outside of the world of Windows, Mac, Linux and BSD.
Disclaimer: This is by no means a complete list! I have not tried ALL of the OSes listed here, some are unmaintainded, so use your own judgement, I'm not responsible for any errors caused by them.
This list is divided up into catagories.
The first catagory list the most well known alternative OSes, these should...