Blurt - Compose efficiently. Edit smartly. Stay on track. Blurt is all you need to write — in one sleek tool.
Markdown Here - Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render...
Ulysses.app - A powerful writing tool for Mac, iPad, and iPhone
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Haven - Personal space security app, backed by Snowden
The Most Dangerous Writing Prompts - Don't stop typing, or all progress will be lost.