Byword - The easy way to write Markdown and rich text on your Mac and iDevices
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.
iA Writer - Minimal Design, Maximum Focus
Stashany - Online notepad for developers
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.
Writebox - Writebox is a simple and distraction-free text editor for Chrome and iPhone/iPad.