Okamoto Hidetaka

This plugin gives you Related Item Widget and function.
If you want to show Related Item List, you can do following actions:
<ul>
<li>Add <code>Elasticommerce Related Widgets</code> in your widgets area.</li>
<li>Add <code>escr_related_item();</code> function in your theme or plugins.</li>
<li>If you only want to get the data, you can use <code>escr_get_related_item();</code> function.</li>
</ul>
Notice 
This plugin requires WooCommerce Plugin , so please install it. If WooCommerce Plugin is not installed or activated, this plugin will not work.
Required 
This Plugin cannot use Elasticsearch version 2.x. Please use Elasticsearch version 1.5 instead.

Elasticommerce Related Items

You can get good Related Item List powered by Elasticsearch.

mattlitzinger

<h4>Features</h4>
<ul>
<li>Give users a “like” action on posts </li>
<li>Display the like count on a post </li>
<li>Custom label text for like count </li>
<li>Disable label text for count site-wide </li>
<li>Choose between a “Thumbs Up” or a “Heart” icon </li>
<li>Limit like action to specific post types</li>
<li>Disable plugin CSS or add custom styling rules </li>
</ul>
By default, the like count will be displayed below the content for individual posts across all post types. You can disable this in the plugin settings or define which post types to include.
If you’d rather display the like count in your template files, use the below code:
<pre><code><?php 
 if( function_exists('wp_recommend_show_likes') ) 
 wp_recommend_show_likes(); 
?>
</code></pre>
<h3>Shortcodes</h3>
The following shortcode will display the like count on any post.
<pre><code>[recommend-likes] 
</code></pre>
The following shortcode will display a list of most liked posts. There are two optional parameters to fine tune the displayed results: <code>post_type</code> and <code>posts_per_page</code>. The default values for these parameters are shown in the example below.
<pre><code>[recommend-liked-posts post_type="post" posts_per_page="5"]
</code></pre>

Recommend

Recommend allows you to add a like user action to your content. Unlike social sharing or commenting, the like action is simple and intuitive.

Elasticommerce Related Items vs Recommend