Mata Nui's Modding Forge

Bionicle modding of all forms - from BTG, to Heroes, to City of Legends, and more to come! 

Take a look at the ModDB pages for BTG, Heroes, and City of Legends to get started:
BTG: https://www.moddb.com/games/bionicle-the-game
City of Legends: https://www.moddb.com/games/bionicle-2-city-of-legends
Heroes: https://www.moddb.com/games/bionicle-heroes