Markdown Here - Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render...
Blurt - Compose efficiently. Edit smartly. Stay on track. Blurt is all you need to write — in one sleek tool.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Ulysses.app - A powerful writing tool for Mac, iPad, and iPhone
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Haven - Personal space security app, backed by Snowden