Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
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.
Trix - A rich text editor for everyday writing.
Pine - A lightweight, modern macOS markdown editor written in Swift
Smart Text Editor - The text editor that requires only a browser and a keyboard
EME - Elegant Markdown editor