I’m going to again recommend the following Writing Tools thread. It has an updated and current listing of programs that are in use by the community.
I also recommend: Ben Serviss’ Six Steps To Writing Interactive Fiction. Ben is a veteran author here and his blogs and posts are great resources for the beginner to learn from (including myself).
He must get tired of me linking him but this stuff should be required reading for anyone trying to make their own game/CS story.