celtx - Integrated Media Pre-Production

QPR - CryingStore - "Cold Tulips" by merlinmann (Celtx - Project Central)

I've recently returned to using the Open Source (MPL-based CePL license) Celtx app for all the script-ish stuff I write. But it does a lot more than just collect and format drafts (which, unlike a text file or MS Word, Celtx does in a way that lets you focus solely on writing, rather than fiddly formatting). It's also an amazingly flexible and robust app for managing all the pre-production materials for screenplays, comics, audio plays, or what have you. And, again: it's totally free.