Script Change is my favorite content tool. It collects the things any great RPG group already does in a cohesive package.

"All right, let's skip this shopping negotiation." 

"Oh wait, I meant the bouncer betrayed you, not the dancer. Let's rewind."

"Hold on! I don't wanna miss this but I need a quick break."

Everything in this toolbox can be used for everyday story maintenance, and using it for those purposes primes even hesitant players to try out safety tools when the need arises. Brie Beau Sheldon has created something wonderful here!