Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
StoryMill - Developers and publishers of Mac, Win, and iOS productivity, home and office and writing software such as MacGourmet, Paperless and many more. Based in MN.
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
BlankPage - Stay motivated to write, and finish your story
Novlr - Online word processor and organizer for novel writing.
Manuskript - Open-source tool for writers.