Nilambar Sharma

<h3>Source Affix</h3>
This is right plugin for you if you want to add source link to your post. It adds separate meta box for the input of source text. You can use this feature to any Post or Page. Even more, it also supports custom post type. Several plugin settings are also available. You can show sources in comma separated form or in an unordered list. You can append or prepend source to the content.

Source Affix

A plugin for adding source links to your Post. Supports Page and Custom Post Type also.

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.

Source Affix vs Power Code Editor