Ruven

This plugin registers a custom post type for galleries and a taxonomy for categories.
Selected themes by Ruven provide templates to display galleries. 
In other themes you most likely have to add them by yourself.

Ruven Themes: Gallery

RT Gallery enables a "Gallery" post type and "Category" taxonomy.

Brecht

Custom Related Posts is a user friendly plugin for manually adding related posts to any of your posts, pages or custom post types. You have full control over those related links, choosing for yourself if they go both ways.
An overview of the features:
<ul>
<li>Set which post types the plugin is active for yourself</li>
<li>Easily define relations in one or both ways on the post edit page</li>
<li>Display related posts with a shortcode, widget or block</li>
<li>Optionally show featured images in any size</li>
<li>Import from XML using post IDs</li>
<li>Compatible with the Classic Editor and Gutenberg Block Editor</li>
</ul>
<blockquote>
Need help? 
 Check out <a href="https://help.bootstrapped.ventures/collection/155-custom-related-posts" rel="nofollow ugc">our documentation</a>!
</blockquote>
This plugin is under active development. Any feature requests are welcome!

Custom Related Posts


I am using it for more than few years. Its perfect.


Awesome


Simple and light, it is all I need for my project. The Gutenberg integration is pretty cool and UI is easy to work with. Thank you.


Works perfectly


Plugin does its job and it is very usable to integrate in large projects. However, author should be caution to announce plugin HTML output change as breaking changes.


A fine plugin!

Manual related posts without slowing down your website!

Ruven Themes: Gallery vs Custom Related Posts