ScriptMaker 

ScriptMaker helps you develop, write and maintain your screenplay and format it to professional standards. It encourages annotation, which is used to navigate the script either via a tree structure or "virtual index cards".
screenwriting scriptwriting script-writng screenplay script

SLang 

SLang helps you develop a story by breaking it down into "Events". You can tell SLang which event depend on which others by using "dependancy rules". SLang can use this information to order events or to analyse individual "threads" within your story.
story writing