Manuskript - Open-source tool for writers.
Dabble Writer - Writing software for novelists.
FocusWriter - FocusWriter is a fullscreen, distraction-free word processor designed to immerse you as much as...
Novlr - Online word processor and organizer for novel writing.
Byword - The easy way to write Markdown and rich text on your Mac and iDevices
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.