Jason

No fancy, complicated syntax highlighting here. The goal of this plugin is to allow your bbPress users to post code snippets in their forum topics and replies without having to learn anything new. Basically, any raw HTML/PHP posted within <code><pre></code> or <code><code></code> tags will automatically be converted and displayed in the forum as you’d expect it would.
And additionally, anything posted within <code><pre></code> tags will be automatically escaped from bbPress applying wpautop. This will allow for your forum users’ code snippets to keep their whitespace as they intend.

bbPress Code Snippets

Automatically display HTML/PHP code posted in bbPress topics and replies.

Gilbert Pellegrom

Prism is a new lightweight, extensible syntax highlighter, built with modern web standards in mind, by 
<a href="http://lea.verou.me" rel="nofollow ugc">Lea Verou</a>. This is a WordPress plugin to make it super simple to use Prism on your 
WordPress site.
Features include:
<ul>
<li>Easy setup (install and activate the plugin and Prism is already working)</li>
<li>Settings page with Theme chooser</li>
<li>Enable/disable Prism plugins as required (all from the settings page)</li>
</ul>
For more info on the Prism plugin see the <a href="http://prismjs.com" rel="nofollow ugc">official site</a>.

Prism Syntax Highlighter

Prism is a new lightweight, extensible syntax highlighter, built with modern web standards in mind, by

bbPress Code Snippets vs Prism Syntax Highlighter