dvddemattia

Free and easy to use plugin that allow you to add a list of related posts for each post, including Custom Post Types.
<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.

Nelio Software

David Aguilera

Get a list of Related Posts by querying your Swiftype account. If Swiftype is 
not available, it uses WordPress’ regular search system. By default, the 
related post search is performed using one of the available tags, but you can 
override it using your own search query string.
<blockquote>
Custom Templates 
 Version 2.1.0 let’s you define your own templates for displaying each related 
 post. Just create a directory named <code>neliosrp</code> in your theme’s directory and 
 create the template you want to use such as, for instance, 
 <code>template-name.php</code>. When inserting the widget, specify that the template is 
 <code>template-name</code> and you’re ready to go!
Warning Remember to save your templates somewhere save before updating 
 your theme!
(In the directory <code>template-examples</code> you’ll find some examples).
</blockquote>
Note If you want to use this plugin with your Swiftype account, please keep 
in mind you must have the official <a href="https://wordpress.org/plugins/swiftype-search/" rel="ugc">Swiftype 
Search</a> plugin installed.
<h4>Features</h4>
<ul>
<li>Swiftype-powered Search The list of related posts is built using your 
Swiftype account.</li>
<li>Regular WordPress Search You can also use the plugin without a Swiftype 
account. Just install the plugin and the regular WordPress search will be used.</li>
<li>Advanced search Related posts are based on tags. However, you can use 
your own search query.</li>
<li>Customization You can tweak a few details of the related post list, such 
as the section title, the number of words in the excerpt, or the number of days 
for the cache will be valid.</li>
</ul>
<h4>Featured On</h4>
<ul>
<li><a href="https://www.facebook.com/swiftype/posts/518418398270015" rel="nofollow ugc">Swiftype’s Facebook 
Page</a> (Facebook)</li>
<li><a href="http://neliosoftware.com/nelio-related-posts/" rel="nofollow ugc">Our New Plugin–Nelio Related 
Posts</a> (Nelio’s blog)</li>
</ul>
<h4>Related Plugins by Nelio</h4>
<ul>
<li><a href="http://nelioabtesting.com/?fp=wordpress.org" rel="nofollow ugc">Nelio A/B Testing</a> | 
<a href="https://wordpress.org/plugins/nelio-ab-testing/" rel="ugc">Download</a></li>
<li>Nelio External Featured Image | 
<a href="https://wordpress.org/plugins/external-featured-image/" rel="ugc">Download</a></li>
<li>Nelio Featured Posts | 
<a href="https://wordpress.org/plugins/nelio-featured-posts/" rel="ugc">Download</a></li>
</ul>
Featured image by <a href="https://www.flickr.com/photos/tomtolkien/4821397096" rel="nofollow ugc">Thomas 
Tolkien</a>

Nelio Related Posts

Get a list of Related Posts by querying your Swiftype account, or using WordPress' regular search functions.

CPTRP vs Nelio Related Posts