Mou is a Markdown editor... with a difference. Where most, if not all, currently available Markdown editors are almost all for general writers, Mou is different: it's for Web developers. Syntax highlighting, live preview, sync scroll, fullscreen mode, auto save, powerful actions, auto pair, custom themes and CSS, HTML and PDF export, enhanced CJK support. I know, it's exactly the app you want.
What's new in Mou
Fixed the pairing quotes "" and three dashes --- bugs.