danielauener

A widget that simply gives you related posts by taxonomy. It provides four 
settings to customize every widget and there are no global settings to worry 
about.
Widget settings
<ol>
<li>The title of the widget (default: Related Posts)</li>
<li>The taxonomy by which terms the posts are related (default: Tags)</li>
<li>How many related posts to show (default 5)</li>
<li>excludet terms</li>
</ol>
The widget is visible only when <code>is_single()</code> is true, it doesn’t shows up on 
archives, search templates etc.
Translation credits
Thanks to Borisa Djuraskovic from <a href="http://www.webhostinghub.com" rel="nofollow ugc">http://www.webhostinghub.com</a> for the Serbian translation!

Simply Related Posts

A widget that simply gives you related posts by taxonomy. Four settings to customize the widget: title, taxonomy, related posts count, excludet terms

shareaholic

Similar Posts displays a list of posts that are similar or related to the current posts. The list can be customised in many ways. Similarity is judged according to a post’s title, content, and tags and you can adjust the balance of factors to fit your own site.
Few Notable Options
<ul>
<li>complete control over the display & layout of displayed posts</li>
<li>over 30 tags for display template customization</li>
<li>matching of current post’s category, tags, content and author</li>
<li>post excluding by author, ID, category, tags and custom fields</li>
<li>output in posts, widgets and RSS</li>
<li>over 50 options available</li>
</ul>
If you need a plugin that does all the Related Posts compute processing in the cloud, please check out our other <a href="https://shrlc.com/yPInQlI" rel="nofollow ugc">Related Posts & Products WordPress plugin</a>.
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Simply Related Posts vs Similar Posts – Best Related Posts Plugin for WordPress