Manuskript - Open-source tool for writers.
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.
Novelize - Novelize is an online novel writing app designed to keep authors on track.
Novlr - Online word processor and organizer for novel writing.
BlankPage - Stay motivated to write, and finish your story