Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Markdown Here - Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render...
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Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
GitHub File Icon - A browser extension which gives different icons on GitHub.
The Most Dangerous Writing Prompts - Don't stop typing, or all progress will be lost.