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.

jamesona

Allows users to save scripts and code snippets, using built in WordPress post revisioning. 
Scripts will be shown on yourblog.com/code. 
Using curl on a script url
<blockquote>
curl -sS yourblog.com/code/scriptname/
</blockquote>
will return an unformatted version of the code, suitable for shell sourcing.

Code Repository

Allows users to save scripts and code snippets, using the built-in WordPress post revisioning system.

Source Affix vs Code Repository