After three years, I am retiring RFMarkdownTextView (an Objective-C markdown editor). I wasn't able to give it the attention it deserved.
As a replacement, I just released Notepad, a new Swift 3.0 Markdown editor. Notepad is faster, fully themeable, and more extensible as a library. Be sure to check it out.
If you are interested in the old editor, all of the history is preserved in this tree.