FocusWriter - FocusWriter is a fullscreen, distraction-free word processor designed to immerse you as much as...
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.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
BlankPage - Stay motivated to write, and finish your story
iA Writer - Minimal Design, Maximum Focus
Manuskript - Open-source tool for writers.