Editor for Markdown documents.
A free alpha markdown editor for OS X 10.6 that lets you preview your document as you write it, according to Markdown syntax
No, Really, What Is It?
A Markdown editor that formats your Markdown document as you write it. It’s not quite a WYSIWYG editor, as the markup is still visible in the editor. It’s more of a preview so you get an idea how your document will be processed by Markdown.pl, or any of the plethora of Markdown variants.