WP Sites - Brad Dalton

This plugin uses the Google Code Prettify Script to Highlight & Style Code
The plugin also adds styling to the existing pre Quick tag in your WordPress text editor
NO shortcodes which look bad if you stop using the plugin
All the code for this plugin comes from WordPress.org & Google
Become a fan of WP Sites on Facebook!
http://www.facebook.com/wpsites.net
Or Get The Latest WordPress Tips, Tutorials & News on Twitter!
http://twitter.com/wpsitesdotnet

Code Highlight

PiotrPress

Clearcode

The CC-Syntax-Highlight plugin supports syntax highlighting of Posts, Pages, and any public Custom Post Types. 
It uses <a href="https://highlightjs.org/" rel="nofollow ugc">highlight.js</a> or <a href="https://github.com/google/code-prettify" rel="nofollow ugc">google-code-prettify</a> libraries. 
Additionally it can use the <a href="https://clipboardjs.com/" rel="nofollow ugc">clipboard.js</a> library to add a button that copies text to the clipboard and <a href="https://github.com/wcoder/highlightjs-line-numbers.js/" rel="nofollow ugc">highlightjs-line-numbers.js</a> plugin to add line numbers. 
It is delivered with support for shortcode (default [code] – you can change it on the settings page) which automatically converts all special characters to HTML entities. 
This plugin is compatible with Multisite WordPress installations.
<h4>How does it work?</h4>
<ol>
<li>Go to the ‘Settings > Syntax Highlight’ page, select your preferred options and save them.</li>
<li>Simply add the source code to your post (or other selected public Custom Post Type) wrapped with: 
<pre><code>Your source code</code></pre> 
or if you would like to automatically convert all special characters to HTML entities, use shortcode wrapper instead (default [code] – you can change it on the settings page): 
<pre>[code]Your source code[/code]</pre></li>
</ol>
Plugin’s js scripts and css styles files only load if the source code occurs on displaying page.

CC-Syntax-Highlight

This plugin allows you very simply syntax highlight source code in your content using highlight.js or google-code-prettify libraries.

Code Highlight vs CC-Syntax-Highlight