Penflip - Typewrite is a real-time collaborative writing environment with Markdown support, versioning and Dropbox syncing. Alternatives to Penflip for Web, Windows, Mac, Linux, iPhone and more.
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.
Pine - A lightweight, modern macOS markdown editor written in Swift
Writebox - Writebox is a simple and distraction-free text editor for Chrome and iPhone/iPad.
EME - Elegant Markdown editor
Calmly Writer - Distraction-free text editor for Mac, Windows, Linux and ChromeOS.