Write App - No-distraction writing tool for your productivity.
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.
Hemingway - Hemingway App makes your writing bold and clear.
BlankPage - Stay motivated to write, and finish your story
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
Manuskript - Open-source tool for writers.