Another interesting free tool: for writing a novel

1. Provide a structure for your story, scenes, chapters, numbering etc etc.
2. Then write.
3. Then, when you need to: see things in overview, detail, structural, character, scenes etc.
4. Repeat 2 and 3.
5. When you have finished, export it to your DTP program.

http://www.spacejock.com/yWriter.html