Tree - Write documents in tree-like organisation with Markdown

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.

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.

Trix - A rich text editor for everyday writing.

Markdown Here - Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render...

Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft