Extramod is a mod for 40d that attempts to add, balance, and tweak while not changing the game significantly. The download contains the modded raw and data files and a readme, not the game itself, so you should be able to play on any platform with a minimum of hassle. Unfortunately for both of my fans, I got bored so this will most likely be the final release.
(v1.5) added a readme for a list of changes

Please report any weird bugs you may encounter on the forum thread.