I was recently shown a program called Celtx, a free (but not OSS) script development tool. It’s based on some of the backend stuff from Firefox and gives the commercial scriptwriting tools a pretty serious challenge. I highly encourage folks who are interested in script development to take a look – not only will it help you collect your ideas and write the actual script, but it will also help with scheduling, budgeting and a number of other tasks related to your production. It runs on OSX, Windows and Linux and seems relatively production-ready. Anybody have other preferences in script development tools?