WriteRoom - For Mac users to write without distractions. WriteRoom is a full screen writing environment.
Minimalist Markdown Editor - This is the simplest and slickest Markdown editor.
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FocusWriter - FocusWriter is a fullscreen, distraction-free word processor designed to immerse you as much as...
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber