Bethesda has announced that the official toolkit for Rage is going to be available on Steam shortly. According to the developer, it’s the same toolkit was used to developer both Rage and the Scorchers DLC.
The file is a 35GB download, and the developer urges gamers to visit the Welcome to the Rage Tool Kit page as well as the FAQ and EULA, both of which are PDF files.
The Toolkit will appear in the Steam Workshop page here.