mayel2b

Helps you more effectively edit your themes or plugins when you only have access to a browser, by enabling syntax highlighting in WordPress’ integrated source code editors. Supports PHP, HTML, CSS and JavaScript.
Please provide any feedback at http://anetech.eu/power-code-editor/
Everything is done in JavaScript on the client side.
At this time, the following browsers are supported: 
* Firefox 1.5 or higher 
* Internet Explorer 6 or higher 
* Safari 3 or higher 
* Opera 9.52 or higher 
* Chrome
Licensed under the GNU GPL v2.
Uses the excellent CodeMirror JS library : 
http://marijn.haverbeke.nl/codemirror/

Power Code Editor

Enables syntax highlighting in the integrated source code editors. Supports PHP, HTML, CSS and JS.

jtgraphic

Do you ever have a really hard getting your code formatted correctly in a post? Or do you ever have issues preserving tabs?
Plum Code Box makes it easy to insert and manage code blocks using the Chili javascript syntax highlighter. The plugin adds option boxes to post and page 
editors. There are also other <a href="http://codeplum.com/wordpress-plugins/" rel="nofollow ugc">WordPress Plugins</a> available from Code Plum.
Twitter: @codeplum
Website: http://codeplum.com
<h3>Donations</h3>
You may make donations at http://www.codeplum.com

Plum Code Box

Plum Code Box makes it easy to insert and manage code blocks using the Chili javascript syntax highlighter.

Power Code Editor vs Plum Code Box