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.

MyWebsiteAdvisor

ChrisHurst

Related Items plugin lets you relate a page, post or custom post type to other pages, posts and custom post types.
Check out the <a href="http://www.youtube.com/watch?v=iy_SCNgTnng" rel="nofollow ugc">Related Items Plugin for WordPress Video</a>:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/iy_SCNgTnng?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&hd=1&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Developer Website: http://MyWebsiteAdvisor.com
Plugin Page: http://mywebsiteadvisor.com/tools/wordpress-plugins/related-items-plugin/
Video Tutorial: http://mywebsiteadvisor.com/learning/video-tutorials/related-items-plugin-for-wordpress-video-tutorial/
We are looking for testimonials and live examples of our plugins on your website! 
Please submit your website or testimonial here: http://MyWebsiteAdvisor.com/testimonials 
If we choose your testimonial or website we can link to your site and generate some free traffic for you!
Features:
<ul>
<li>Add related items to your WordPress Pages, Posts and Costom Post Types.</li>
<li>Re-order related posts via simple drag and drop interface.</li>
<li>Automatically adds a related items section to the bottom of any page/post if it is related to others.</li>
</ul>

Related Items

Related Items plugin lets you relate a page, post or custom post type to other pages, posts and custom post types.

Taxonomy Pages vs Related Items