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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Metup

The CleverNode Related Content plugin allows you to display a collection of related articles, picked among those on your own site. 
The correlation is made through a semantic algorithm that scans both the title and content of your articles in order to select a collection of related posts. 
Articles are displayed as a grid containing the featured image, title and link to the featured article. The position of this grid within the page may be freely chosen.
New in version 1.0.2 
Added AMP support: using the official <a href="https://it.wordpress.org/plugins/amp/" rel="nofollow ugc">AMP plugin for WordPress</a> and the <a href="https://it.wordpress.org/plugins/accelerated-mobile-pages/" rel="nofollow ugc">AMP for WP – Accelerated Mobile Pages</a> plugin, the widget will be rendered as an <code>amp-embed</code>.

CleverNode Related Content

CleverNode Related Content is a semantic correlation service that allows you to place a collection of related articles on your WordPress site.

Similar Posts – Best Related Posts Plugin for WordPress vs CleverNode Related Content