MacDown - MacDown is an open source Markdown editor for OS X, released under the MIT License.
Falcon - Ultraportable 2-in-1 Laptop
Typora - A minimal Markdown reading & writing app.
NotePlan - Make plans inside an individual markdown note for every day in your calendar. Use it as a journal for your daily tasks and plan todos in advance. For Mac, iPhone and iPad.
Pine - A lightweight, modern macOS markdown editor written in Swift
Editorial - Desktop-class text & markdown productivity on iOS