Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Dabble Writer - Writing software for novelists.
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
Novlr - Online word processor and organizer for novel writing.
Manuskript - Open-source tool for writers.
ApolloPad - Great online app for writers, novelists, and bloggers.