MDVG

The plugin is an add-on for the Related Posts by Taxonomy plugin by author keesiemeijer: http://keesiemeijer.wordpress.com/related-posts-by-taxonomy/
That plugin allows you to show thumbnails or links of related articles in a sidebar. This works for a lot of types of content. For example: posts, products, etc.
Unfortunately, that plugin does not work for pages. This add-on solves that issue by creating taxonomies for pages.
<h4>Is this plugin GDPR compliant?</h4>
<ul>
<li>This plugin doesn’t process, share, send or retain any user data.</li>
<li>This plugin doesn’t track (user) data for analytics (or for any other reason).</li>
<li>This plugin doesn’t save or read cookies.</li>
<li>This plugin doesn’t use 3rd party libraries.</li>
</ul>
Read <a href="https://developer.wordpress.org/plugins/wordpress-org/compliance-disclaimers/" rel="nofollow ugc">this article</a> why plugin authors cannot guarantee 100% compliance.
Please contact a GDPR consultant or law firm with this information to assess if this plugin is compliant.

Taxonomy Pages

This plugin is an add-on for the Related Posts by Taxonomy plugin by author keesiemeijer. It allows you to easily display related pages in a sidebar.

dancoded

A simple widget that displays a list of pages related to the current page.
You can choose to show either siblings pages (on the same level), child pages or both, and set how many levels of child pages to show.
You can also enter class(es) to be applied to the widget wrapper or the list (ul element).
If the widget is on a page that is not hierarchical, or if there are no related pages, nothing is displayed.
A hook is available to filter the title: <code>dmg_related_pages_widget_title</code>.
For example, to change the title on a single page or post, you could add this to your functions.php file:
<pre><code>function myTitleFilter( $title )
{
 if( is_singular() )
 {
 return "$title";
 }
 else
 {
 return $title; 
 }
}
add_filter( 'dmg_related_pages_widget_title' , 'myTitleFilter');
</code></pre>
More information about this plugin can be found at <a href="http://dancoded.com/wordpress-plugins/related-pages-widget/" rel="nofollow ugc">http://dancoded.com/wordpress-plugins/related-pages-widget/</a>.
<h3>Adding CSS Class(es)</h3>
Enter strings, either space or comma seperated, which will be applied as CSS classes to the widget wrapper and/or the list wrapper. These classes are sanitized using the <code>sanitize_html_class()</code> function built in to WordPress.
<h3>Make the Title a link</h3>
Enter a valid URL to make the title a link.

DMG Related Pages Widget

Widget that displays a list of pages related to the current page in your sidebar. Advanced options allow you to control which pages are shown, add CSS …

Taxonomy Pages vs DMG Related Pages Widget