Last week, a friend asked me what software I use to write my books. I was a bit surprised by the question. I just type my novels into Word. The publishers want the books in Word, or Word's rtf--depending on the publisher's preference. I don't know of any other authors who use a special software to create their stories--and I belong to several writing groups. None of those groups has ever had a workshop on writing software. Of course, I only belong to fiction writing groups. We all make up stuff in our heads and I don't know how that could ever be programmed. :^)
I went online and discovered a wealth of software programs for those who want to write a book. Some are very expensive. You can see a bunch of them here.
In looking at the features of the various programs, I must admit that having a program to help organize an index for a non-fiction book would probably be a good idea. However, for a fiction book, there is no index.
I have attended many, many writing workshops. I have read many books on writing. I have had my work critiqued. I own several dictionaries and I am a frequent visitor at dictionary.com. I have a favorite thesaurus. I write my own outlines and if I need to brainstorm, I call up a friend.
Word count and spellcheck are built into Word, but it's always good to have a real editor because Word can screw things up.
I think the best aid to help any writer in getting the job done is to put glue on the chair and sit down. Then just write and keep writing. Don't stop until you've reached the end.
You can save a lot of money on software programs that way.