"Simple dynamic site generator with standardised templating tools: certainly looks nice for building those early-stage prototypes before you need a full backend."

"Parses your readme's markdown into a clean and simple documentation website. Made especially for your gh-pages branch, all you need is a single index.html file that includes the DocumentUp script."

"A simple online tool that converts static Markdown text files located in your Dropbox, into a beautiful web log."

"A cloud-enabled HTML5 Markdown editor". Hot. Wish it was native.

"I forked the excellent (open source!) Notational Velocity app, and hacked in a third pane that shows you the note you’re viewing as rendered by Markdown." Binaries on the github downloads page. Hope this gets put into the master.

"A program for converting between various markup formats. Input formats include markdown, reStructuredText, HTML, and LaTeX; output formats include HTML, LaTeX, ConTeXt, S5, DocBook, groff man, reStructuredText, markdown, and RTF."