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 thepage as well as the , both of which are PDF files.
The Toolkit will appear in the Steam Workshop page.
Rage toolkit hitting Steam
10 February 2013 | By JonahFalcon