Manuskript - Open-source tool for writers.
WriteNext - The writing application that boosts your writing. Increase focus and writing performance and reduce distractions by separating your creative writing from other activities. Let writing be the only activity you perform in the writing application.
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.
Writebox - Writebox is a simple and distraction-free text editor for Chrome and iPhone/iPad.
Novelize - Novelize is an online novel writing app designed to keep authors on track.
Calmly Writer - Distraction-free text editor for Mac, Windows, Linux and ChromeOS.