The Rage Tool Kit arrives on Steam today, to help you with your primal scream therapy and/or create mods for iD Software's idTech 5 game. The mod tools were originally planned to launch alongside the game, but work on that fell to the wayside in favor of Doom 3 BFG.

There'll still be some waiting involved after today's release, as the file is a "hefty 35+ GB." It'll be in the Tools section of Steam when it arrives. Prepare yourself before or during that long, long download by reading the FAQ.