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.
Ulysses.app - A powerful writing tool for Mac, iPad, and iPhone
Markdown to PDF - Super simple way to get your markdown files to PDF
Markdown to Medium - Create Medium posts from Markdown in a snap
UnMarkDocs - Unleash the Power of Markdown to Write Better Product Documentation
JotterPad - JotterPad Writer for Android — Turn your thoughts into text. Go about your creative writing without distractions, write to your hearts content...