MultiMarkdown Composer and Marked 2 fit my Markdown needs perfectly. One key item is that I can drag a photo into the MultiMarkdown window and it’ll insert the image syntax with relative paths. For some reason that feature I need is astonishingly rare on other editors I’ve trialed. MultiMarkdown Composer can be set to automatically launch Marked 2 for previews and proofing – real nice. It is a bonus that Marked 2 can easily preview MarsEdit in-progress posts too. I’m using the Pandoctor style in Marked 2 since that matches Pandoc output of my Markdown journalling files. However, I had to edit its CSS to remove paragraph indentations.