Rage Tool Kit hitting Steam later today
 

So it turns out that Rage didn't ship with mod tools after all. It's only taken id Software... a year, four months, and four days to deliver, but at long last, according to the official Bethesda Blog, the Rage Tool Kit will be arriving on Steam later today. You'll be able to grab it in the "Tools" section of your Steam client.

http://techreport.com/news/24339/rag...am-later-today