Markus Echterhoff

This is the Markdown plugin for bbPress that I needed, but could not find. It replaces the standard editor with a responsive Markdown form that includes a preview and formatting help. The Markdown is parsed using PHP Markdown(Extra) and saved as a regular HTML bbPress post. The Markdown is saved separately for later editing. The plugin can be activated and deactivated without affecting your bbPress data, it uninstalls cleanly (deleting any saved Markdown code) and is multisite compatible.
Tip: You can give the plugin a slight performance boost if your forum is Markdown only or you don’t care that some non-Markdown posts are displayed slightly different than before (e.g. not turning newlines into paragraphs or no longer making URLs automatically clickable), by adding the following to your theme’s functions.php: <code>add_filter( 'bbpmd_remove_output_filters_for_all_posts', '__return_true' );</code>

bbP Markdown

Thank you for this well-designed plugin, it works seamlessly with existing bbPress setup.

I appreciate the effort and thought put into it, for example, how it integrates techniques from several other related plugins, and how it uninstalls cleanly.

One thing I wish it had is a way to apply the same Markdown editor to normal comments as well.

Works wonders

Elegant Markdown support for your bbPress forums.

JHoppe

Damn simple [markdown]#via shortcode[/markdown] for wordpress. 
This plugin uses <a href="http://parsedown.org/" rel="nofollow ugc">parsedown</a> and <a href="http://highlightjs.org" rel="nofollow ugc">highlight.js</a>. Zero configuration.
Write this into the editor:
<pre><code>[markdown] 
#h1
</code></pre>
<h3>h2</h3>
<pre><code>text 
____source code (two ore more underscores will be replaced by empty spaces) 
____source code (two ore more underscores will be replaced by empty spaces) 

 `javascript
source code
 `
[/markdown]
</code></pre>
and the shortcode content will be parsed with parsedown. Syntax highlighting will appear for the source codes.
This plugin is available at <a href="https://github.com/JohannesHoppe/markdown-shortcode" rel="nofollow ugc">github</a>, too. 
Please report issues at github, pull requests are welcome, too!

Markdown Shortcode

Damn simple markdown for wordpress via shortcode, uses parsedown (parsedown.org) and highlight.js (highlightjs.org).

bbP Markdown vs Markdown Shortcode