This weekend d2project has made available the source code for two Nintendo Wii mod-chips, namely the D2CKey and D2Pro Mod-Chip.
To quote: "This is the official open source repository for d2ckey and d2pro. VHDL, MN102 drivecode, and Gamecube configuration / update discs is hosted here.
All code is licensed under GPL v3. If you are interested in contributing to this...