kennydude

MarkItUp (beta) allows for you to use Markdown on your WordPress site.
It does this on a per-author basis and per-post. This means that you shouldn’t be accidently converting other people’s posts/pages into Markdown by accident!
Currently this wears the beta label because it could have little bumps which aren’t smoothed out just yet.

MarkItUp!

MarkitUp (beta) is a wordpress plugin which allows you to use Markdown on your site without breaking existing content

petermolnar

Parse the_content with <a href="http://www.parsedown.org/demo?extra=1" rel="nofollow ugc">Parsedown Extra</a> to display <a href="https://en.wikipedia.org/wiki/Markdown_Extra" rel="nofollow ugc">Markdown Extra</a> content in HTML parser.

WP-Parsedown

Parse the_content with Parsedown Extra to display Markdown Extra content in HTML parser.

MarkItUp! vs WP-Parsedown