This is Garrett Murray's Maniacal Rage

I’ve wanted something like Fountain for years. It reminds me of the TextMate bundle Oliver Taylor wrote back in the day, only this time it’s not a single-app hack, it’s a true, Markdown-esque formatting syntax for writing screenplays. And because it’s only a syntax, it can be used my any application in the future to render correctly-formatted scripts on the fly, while maintaining a completely text-based original that’s easy to update, modify and archive. This is huge.