Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render it before sending.

Rpub is a command-line tool that generates a collection of plain text input files into an eBook in ePub format.

This package will make MarkdownEditor your default theme for Markdown/MultiMarkdown files. Adjust it to your liking or remove the line from the .sublime-settings files

Markdown to HTML converter and editor for Twitter Bootstrap based on http://code.google.com/p/pagedown/

After asking me for a reference code it returns the reference code and URL in exactly the format I need, ready to copy into my document. Simple, quick, painless.

Markdown Service Tools is a collection of OS X Services to make creating Markdown-formatted text that much easier. Services work in any Cocoa based application.

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

When current available Markdown editors are almost all for general writers, Mou is different: It's for web developers.

ReMarkdown is a CSS experiment and reusable stylesheet for displaying simple HTML text as its Markdown equivalent. To get a feel of what it does, look at the HTML source of this very page.

MultiMarkdown gives us a simple, intuitive way to make HTML tables without generating an amorphous blob of code. Instead of remembering HTML table codes, you simply use the pipe symbol | to separate columns.

A free alpha markdown editor for OS X 10.6 that lets you preview your document as you write it, according to Markdown syntax

Markdown Service Tools is a collection of OS X Services to make creating Markdown-formatted text that much easier.

There might be some other way, but for now what I had to do was to save the HTML generated from the Markdown conversion to a temporary file, then open that in Safari, have Safari select all and copy to the clipboard (copying an HTML object), then having Mail paste it – replacing the selected Markdown text. So, the service workflow takes the selected text, but does not itself replace the selection directly.

A PHP script and style file for generating rendered HTML from Markdown for pasting into mail messages. I use it instead of WYSIWYG editing in Rich Text mode because I'm so used to working in Markdown.

I run this from TextMate using the Mail Preview command:

So, I experimented. And the good news is that since Snow Leopard came out, with its improvements to the Services menu and Automator support, adding Markdown conversion to the Services menu yourself is an absolute doddle. I took a guess and what I did worked first time.

I've scoped Pandoc as a flavor of markdown: text.html.markdown.pandoc. So if you have a markdown bundle installed, those commands should also work in this bundle.