Textile - Textile is a lightweight markup language originally developed by Dean Allen and billed as a...

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.

Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber

Markdown to PDF - Super simple way to get your markdown files to PDF

GitHub Flavored Markdown - GitHub uses "GitHub Flavored Markdown," or GFM, across the site--in issues, comments, and...

UnMarkDocs - Unleash the Power of Markdown to Write Better Product Documentation