There are 6 repositories under steam-controller topic.
User-mode driver and GTK3 based GUI for Steam Controller
Steam Controller reverse engineering and customization project.
An executable wrapper for Steam to make third-party launchers more convenient to use with a Steam Controller
Steam Controller support for iOS and tvOS
External Arduino gyroscope & pedals for any Xbox compatible gamepads / Внешний Arduino гироскоп и педали для Xbox совместимых геймпадов
An offshot of the SteamControllerSigner that aims to take advantage of the SC's dual pulse channel nature
:video_game: Controller profiles made for using with Steam
controller mappings, voice profiles, and other configs for the Elite Dangerous game
An actually working Garfield Kart controller setup
Steam Controller bindings for Elite: Dangerous with support for flight assist off and Odyssey