Fountain is a plain-text syntax for writing screenplays. (The Fountain syntax is similar to that of Markdown, a general-purpose syntax.) Fountain files are designed to be very readable, but they can be easily converted to other formats (like PDF and FDX) using Fountain-friendly applications.
Nima Yousefi's regular expressions for Fountain have been very helpful while working on this project.
Syntax Highlighting: Scene headings, sections, character elements, transitions, comments, and other important aspects of the script are highlighted.
Scene Navigation: Scene headings and sections are tracked and collected in the function pull-down menu of the navigation bar.
Scene and Section Folding: Scenes and sections can be collapsed to save screen space.
If you're using TextWrangler, move
~/Library/Application Support/TextWrangler/Language Modules/
If you're using BBEdit, move
~/Library/Application Support/BBEdit/Language Modules/
Restart TextWrangler or BBEdit to complete the installation.