Revolution Engine is the very First homebrew 3D Game Engine for Wii. It is directly based on GX without any GL wrapper or anything similar. Natively designed for the Wii, this engine is probably capable of generating the best homebrew graphics ever seen on this game console.

Changes:

Better memory management
Added an advanced screenshot function
Added offClick onOver and offOver functions to buttons
Added getType, getParent, getNext and getChild functions to N2D and NODE classes
Improved directional lights constructor
new type(WINDOW) for 2d system
Added a custom expansion for 2d nodes and 3d nodes. This will allow more flexibility.
Increased flexibility of Tev system (now using more efficiently, same number of TEV stages let you do a little more)
Lighing speed boost, speed up the engine about 8%

http://wiibrew.org/wiki/Revolution_Engine