Brett Terpstra is kind of legendary in nerd circles. He makes wonderful tools that makes our lives easier. I bought Marked 2 when he first released it outside of the App Store and use it all the time. Now Brett has the app for sale in the Mac App Store. It's more customizable than ever before with themes and advanced writing and proofreading tools.
For a limited time, Marked 2 will be available for $9.99. The regular price will be $13.99. This will serve as both "introductory" pricing for new users and "upgrade" pricing for existing users of Marked 1.4.