alphasis

<p>This Plugin will display the related posts list via categories.<br />
It can automatically display the related posts list after the content of any single post of selected post types by options.<br />
There are many options for the display, order, exclusion and post-type selection.<br />
This plugin works when viewing a post of selected post types by options.<br />
This plugin requires jQuery 1.6 or higher.</p>
<h4>Official Page</h4>
<ul>
<li>Plugin’s Official Page : <a href="http://alphasis.info/developments/wordpress-plugins/related-posts-via-categories/" title="Plugin's Official Page in English" rel="nofollow ugc">English</a> / <a href="http://alphasis.info/kaihatu/wordpress-plugins/related-posts-via-categories/" title="Plugin's Official Page in Japanese" rel="nofollow ugc">Japanese</a></li>
<li>Author’s Website : <a href="http://alphasis.info/" title="alphasis.info" rel="nofollow ugc">alphasis.info</a> (Japanese) » <a href="http://alphasis.info/developments/wordpress-plugins/" title="WordPress Plugins" rel="nofollow ugc">WordPress Plugins</a> (English)</li>
</ul>
<h4>Related Posts via Categories – Options</h4>
<p>‘Settings’ » ‘Related Posts via Categories’</p>
<h4>Display</h4>
<ul>
<li>Auto display
<ul>
<li>This option automatically displays related posts after the content on the single post page.</li>
<li>If this option is off, you will need to manually insert <code>display_related_posts_via_categories()</code> into your theme files.</li>
</ul>
</li>
<li>Maximum number of related posts
<ul>
<li>If you do not enter anything: 10</li>
</ul>
</li>
<li>Related posts title
<ul>
<li>For example: Related Posts</li>
</ul>
</li>
<li>Before related posts title and related posts
<ul>
<li>For example: <code><div id="related-posts-via-categories"></code></li>
</ul>
</li>
<li>After related posts title and related posts
<ul>
<li>For example: <code></div></code></li>
</ul>
</li>
<li>Before related posts title
<ul>
<li>For example: <code><h2 id="related-posts-via-categories-title"></code></li>
</ul>
</li>
<li>After related posts title
<ul>
<li>For example: <code></h2></code></li>
</ul>
</li>
<li>Before related posts
<ul>
<li>For example: <code><ul id="related-posts-via-categories-list"></code></li>
</ul>
</li>
<li>After related posts
<ul>
<li>For example: <code></ul></code></li>
</ul>
</li>
<li>Before each related post
<ul>
<li>For example: <code><li class="related-posts-via-categories-item"></code></li>
</ul>
</li>
<li>After each related post
<ul>
<li>For example: <code></li></code></li>
</ul>
</li>
</ul>
<h4>Order</h4>
<ul>
<li>Order By
<ul>
<li>Related Scores : High  ( Speedy ) </li>
<li>Related Scores : High / Date Published : New ( Default setting )</li>
<li>Related Scores : High / Date Published : Old</li>
<li>Related Scores : Low / Date Published : New</li>
<li>Related Scores : Low / Date Published : Old</li>
<li>Related Scores : High / Date Modified : New</li>
<li>Related Scores : High / Date Modified : Old</li>
<li>Related Scores : Low / Date Modified : New</li>
<li>Related Scores : Low / Date Modified : Old</li>
<li>Date Published : New</li>
<li>Date Published : Old</li>
<li>Date Modified : New</li>
<li>Date Modified : Old</li>
</ul>
</li>
</ul>
<h4>Exclude</h4>
<ul>
<li>Exclude (Posts)
<ul>
<li>The IDs of any posts you want to exclude, separated by commas.</li>
</ul>
</li>
<li>Exclude (Categories)
<ul>
<li>Select checkboxes of any categories you want to exclude.</li>
</ul>
</li>
</ul>
<h4>Post types</h4>
<ul>
<li>Select checkboxes of any post types you want to include in the list of Related Posts and display the list.</li>
<li>Displays checkboxes of them when there is any custom post types.</li>
</ul>
<h4>Localization</h4>
<ul>
<li>Japanese (ja) – <a href="http://alphasis.info/" title="alphasis.info" rel="nofollow ugc">alphasis</a> (plugin author)</li>
<li>Persian (fa_IR) – <a href="http://qanal.ir/" title="Omid Sheerkavand" rel="nofollow ugc">Omid Sheerkavand</a></li>
<li>Armenian (hy_AM) – <a href="http://ablog.gratun.am" title="Artak Kolyan" rel="nofollow ugc">Artak Kolyan</a></li>
<li>Current release supports English, Persian, Armenian and Japanese.</li>
</ul>


Marcel Pol

Benoit Chantre

Remco

<p>A simple ‘related posts’ plugin that lets you select related posts manually. Supports any post types in WordPress, including custom ones.</p>
<p>Features:</p>
<ul>
<li>Add related posts to your blog posts, pages etc.</li>
<li>Choose from posts, pages or custom post types.</li>
<li>Re-order related posts via drag and drop.</li>
<li>Lightweight in code and database-requests.</li>
<li>Includes Widget that shows the related posts.</li>
<li>List of posts can also be added to the content of your post.</li>
<li>Custom markup possible, build your own caroussel or anything you fancy.</li>
<li>Support for multilanguage plugins, like WPML and Qtranslate-X.</li>
<li>Duplicate plugin Related (Doubled Up) is included to build a second list.</li>
</ul>
<p>The plugin was written to have the option to add related posts to each blog post using a simple but functional plugin. You can select the related posts yourself manually.</p>
<p>To display the related posts, there are three options:</p>
<ul>
<li>You can use the widget that is included.</li>
<li>Use the content filter inside the settings.</li>
<li>Add PHP code to your template, see the installation docs.</li>
</ul>
<p>For advanced options, see the installation docs.</p>
<h4>Compatibility</h4>
<p>This plugin is compatible with <a href="https://www.classicpress.net" rel="nofollow ugc">ClassicPress</a>.</p>
<h4>Contributions</h4>
<p>This plugin is also available in <a href="https://codeberg.org/cyclotouriste/related" rel="nofollow ugc">Codeberg</a>.</p>


Manual Related Posts

Does exactly what is says it will. Very easy to integrate where you need it. Kudos to the dev who made it.

Simple and Easy to integrate

Very handy plugin for manually set your related posts !

Simple and Efficient

A simple 'related posts' plugin that lets you select related posts manually.

Related Posts via Categories vs Manual Related Posts