Stephen Harris

This plugin allows you to write posts (of any post type) using the Markdown syntax. The plugin converts the Markdown into HTML prior to saving the post. When editing a post, the plugin converts it back into Markdown syntax.
The plugin also allows you to enable Markdown in comments and bbPress forums. In these instances the plugin adds a toolbar, and preview of the processed Markdown with <a href="http://code.google.com/p/google-code-prettify/" rel="nofollow ugc">Prettify</a> syntax highlighter applied (similiar to that used in the Stack Exchange websites such as <a href="http://wordpress.stackexchange.com/" rel="nofollow ugc">WordPress Stack Exchange</a>).
WP-Markdown stores the processed HTML, so deactivating the plugin will not affect your posts, comments or bbPress forums.

WP-Markdown

Version 1.5.1 of the plugin works almost perfectly.
I'm just waiting for the upcoming 1.6 update (which is in alpha on GitHub) to be pushed, so I can use GitHub Flavor-style codeblocks specifying the exact language.



Waiting for 1.6

Allows Markdown to be enabled in posts, comments and bbPress forums.

Simon Ugorji

<blockquote>
PLEASE NOTE THAT THIS PLUGIN DOES NOT AND WILL NEVER EXECUTE ANY TYPE OF CODE ON YOUR WORDPRESS SITE!
</blockquote>
This plugin uses Google Prettify which is an open-source syntax highlighting library.
This plugin relies on 3rd party services under the circumstances below;
<ol>
<li>
<a href="https://github.com/googlearchive/code-prettify/" rel="nofollow ugc">Syntax highlighting</a> – This is the core library that will make your snippets to be formatted according to your chosen language.
</li>
<li>
<a href="https://jmblog.github.io/color-themes-for-google-code-prettify/" rel="nofollow ugc">Color Themes</a> – This is the color themes that can be used to change what your code snippets looks like
</li>
</ol>
You can find the Terms of Use and privacy policy on the links above.
<h3>HOW TO USE</h3>
CREATE A NEW SNIPPET
<ol>
<li>Head Over to the New Snippet page to create a New Code Snippet.</li>
<li>On the page, add a title for the new snippet.</li>
<li>Select the Language you’re working with.</li>
<li>Type in the code in the code box and when you’re done, click on Preview.</li>
<li>Click on Save to save your code snippet.</li>
</ol>
<blockquote>
NOTE: YOUR CODE SNIPPETS ARE ENCODED AND STORED AS PLAIN TEXT TO PREVENT ITS EXECUTION
</blockquote>
MANAGE CODE SNIPPETS
<ol>
<li>Head Over to the All Snippets page to view existing code snippets.</li>
<li>You can click on the Copy button to copy the shortcode for the snippet.</li>
<li>You can click on the Edit button to edit a code snippet.</li>
<li>You can click on the Delete button to delete a code snippet.</li>
</ol>
EDIT CODE SNIPPET
<ol>
<li>Head Over to the All Snippets page to view existing code snippets.</li>
<li>Click on the Edit button to redirect you to the edit page.</li>
<li>On the Edit page, change the title for the snippet.</li>
<li>Change the Language you’re working with.</li>
<li>Modify the code in the code box and when you’re done, click on Update.</li>
</ol>
EMBED CODE SNIPPET
<ol>
<li>Head Over to the All Snippets page to view existing code snippets.</li>
<li>Click on the Copy button to copy the shortcode for the snippet.</li>
<li>In any of your wordpress posts, place the copied shortcode & save the post.</li>
<li>Preview the post to see the snippet embedded right where you want it.</li>
</ol>

Coding Blocks

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WP-Markdown vs Coding Blocks