Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
Trelby - The free, multiplatform, feature-rich screenwriting program!
Manuskript - Open-source tool for writers.
Movie Magic Screenwriter - Movie Magic® Screenwriter™ 6 is an award-winning screenwriting software that formats movies, television, novels, stage plays and even comic book scripts, making it the only program for all types of creative writing.
WriterDuet - Collaborative screenwriting for everyone* *Great for solo writers as well!