Manuskript - Open-source tool for writers.
iA Writer - Minimal Design, Maximum Focus
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.
Atlantis Word Processor - Atlantis Word Processor enables users to create documents and reports and to publish e-books.
Novelize - Novelize is an online novel writing app designed to keep authors on track.
OmmWriter - Ommwriter is a simple text processor that firmly believes in making writing a pleasure once again, reinvindicating the close relationship between writer and paper.