Alex Mansfield

This plugin allows you to easily add code to your pages and posts without worrying about what the WordPress editor will do to it. You can embed HTML, video embed codes, Paypal forms, Google maps and more. Please note: this plugin will not allow you to run server side scripts such as PHP.
To use the plugin, all you have to do is create a custom field (you can name it anything), place your code in the new custom field, and place the following shortcode into your post where you want the code to go:
<pre><code>[easyembed field="name-of-custom-field"]
</code></pre>

Easy Embed

Allows any code to be easily embedded in posts and pages.

mohanjith

SyntaxHighlighter2 allows you to easily post syntax highlighted code all without loosing it’s formatting or making an manual changes.
It supports the following languages (the alias for use in the post is listed next to the name):
<ul>
<li>AS3 — <code>as</code>, <code>as3</code></li>
<li>C++ — <code>cpp</code>, <code>c</code>, <code>c++</code></li>
<li>C# — <code>c#</code>, <code>c-sharp</code>, <code>csharp</code></li>
<li>ColdFusion – <code>cf</code>, <code>coldfusion</code></li>
<li>CSS — <code>css</code></li>
<li>Delphi — <code>delphi</code>, <code>pascal</code></li>
<li>Diff/Patches — <code>diff</code></li>
<li>Erlang — <code>erlang</code></li>
<li>Groovy — <code>groovy</code></li>
<li>Java — <code>java</code></li>
<li>JavaFX — <code>javafx</code></li>
<li>JavaScript — <code>js</code>, <code>jscript</code>, <code>javascript</code></li>
<li>Perl — <code>perl</code></li>
<li>PHP — <code>php</code></li>
<li>Plain text — <code>plain</code></li>
<li>PowerShell — <code>powershell</code></li>
<li>Python — <code>py</code>, <code>python</code></li>
<li>Ruby — <code>rb</code>, <code>ruby</code>, <code>rails</code>, <code>ror</code></li>
<li>Scala — <code>scala</code></li>
<li>SQL — <code>sql</code></li>
<li>VB — <code>vb</code>, <code>vb.net</code></li>
<li>XML/HTML — <code>xml</code>, <code>html</code>, <code>xhtml</code>, <code>xslt</code></li>
</ul>
This plugin uses the <a href="http://alexgorbatchev.com/wiki/SyntaxHighlighter" rel="nofollow ugc">SyntaxHighlighter JavaScript package by Alex Gorbatchev</a>.
<h3>Other BBCode Methods</h3>
Find <code>[sourcecode language='css']code here[/sourcecode]</code> too long to type? Here’s some alternative examples:
<ul>
<li><code>[source language='css']code here[/source]</code></li>
<li>
<code>[code language='css']code here[/code]</code>
</li>
<li>
<code>[sourcecode lang='css']code here[/sourcecode]</code>
</li>
<li><code>[source lang='css']code here[/source]</code></li>
<li>
<code>[code lang='css']code here[/code]</code>
</li>
<li>
<code>[sourcecode='css']code here[/sourcecode]</code>
</li>
<li><code>[source='css']code here[/source]</code></li>
<li><code>[code='css']code here[/code]</code></li>
</ul>
<h3>PHP Version</h3>
PHP 5+

SyntaxHighlighter2

Easily post source code such as PHP or HTML and display it in a styled box.

Easy Embed vs SyntaxHighlighter2