dvddemattia

<p>Free and easy to use plugin that allow you to add a list of related posts for each post, including Custom Post Types.</p>
<h3>Features And Options:</h3>
<ul>
<li>Add relations between posts.</li>
<li>Set number of related posts (1-20).</li>
<li>Custom title and custom template path.</li>
<li>Working with shortcode [cptrp].</li>
<li>Simple and free.</li>
<li>More features coming on updates.</li>
</ul>


CPTRP

Plugin that allow you to add a list of related posts for each post, including Custom Post Types.

eduardosada

<p>WP-TagTip is an sexy way to show a related post of one specific tag with tooltips.</p>
<p>Please visit <a href="http://www.coders.me/wordpress/wp-tagtip" title="WP-TagTip" rel="nofollow ugc">the official website</a> for further details and the latest information on this plugin.</p>
<h4>Licence</h4>
<p>This plugins is released under the MIT, you can use it free of charge on your personal or commercial blog.</p>


WP-TagTip

An sexy way to show a related post of one specific tag.

CPTRP vs WP-TagTip