James Kemp

This plugin allows you to list any number of related posts from the same category as the current post. You can also randomise these results. It is very lightweight, at only 3KB.
There are a number of options available:
<ul>
<li>Choose the number of Posts to show</li>
<li>Choose whether it displays these posts randomly, or in order specified by you.</li>
<li>Choose whether to display a title, what tags to use, and what text should be displayed (e.g. H3)</li>
<li>Choose a class for the main UL</li>
</ul>
To display the random related posts in its simplest form, simply place the following code in your single.php file – <code><?php relatedPosts(); ?></code>.
To edit the options availble, use the following codes:
<pre><code><?php relatedPosts(
 $ppp = 4, 
 $rand = true, 
 $rPinctitle = true, 
 $rPtitletag = 'h3', 
 $rPtitle = 'Related Posts', 
 $rPulclass = 'related_posts',
 $orderby = 'title', 
 $order = 'ASC'
); ?>
</code></pre>
Where:
<ul>
<li>$ppp = Number of posts to display (Any integer allowed)</li>
<li>$rand = sets the display to random (true/false)</li>
<li>$rPinctitle = Displays the title (true/false)</li>
<li>$rPtitletag = The type of tag to wrap the title in (Default h3, but it can be any valid HTML tag)</li>
<li>$rPtitle = The title to be displayed (This can be any text value)</li>
<li>$rPulclass = This sets the class of the ul (This can be any text value)</li>
<li>$rPexcerpt = Displays the post excerpt (true/false)</li>
<li>$orderby = This allows you to order the posts by certain parameters (title/author/date/modified/menu_order/parent/ID/none/comment_count) If you want to choose the order of your posts, be sure to set $rand to false</li>
<li>$order = This can either be Ascending or Descending (ASC/DESC)</li>
</ul>

Random Related Posts Based on Category

This plugin allows you to list any number of related posts from the same category as the current post. You can also randomise these results.

WPClever

Promoting related products, upsells, or cross-sells are among the most effective and common ways to encourage buyers to find out more choices and close the deal with a higher amount than their original intentions. WPC Smart Linked Products plugin is such a useful plugin to help store owners suggest more good items to buyers, which acts as a smart sale promoter for any online businesses.
Combining with the <a href="https://wordpress.org/plugins/wpc-custom-related-products/" rel="ugc">WPC Custom Related Products</a> plugin, which is specialized in dealing with related products, WPC Smart Linked Products will lay everything on the table for customers to easily make comparisons, analyze the needs & budgets, and decide faster. This makes people either end up purchasing an upsell version or upgrading their order value with related products & cross-sell products. Even when they decide to go back to their first choice, they have stayed on your site longer. Eventually, the sale revenue can see great improvements while more products are being paid attention.
Worth mentioning is, this plugin is so versatile and powerful that users can define the sources for the main product & applicable linked products in abundant ways: storewide products, selected items, product types, tags, categories, attributes, etc. Users can also limit the number of linked products and order them to show the priority choice. It’s now saving you more time and effort when configuring upsells & cross-sells with the comprehensive list of sources and rules at hands.
<h4>Benefits</h4>
<ul>
<li>Increase sale revenue vertically and/or horizontally</li>
<li>Get more attention to more product lines & deals</li>
<li>Convert more visitors into customers with ease</li>
<li>Build better product and brand awareness</li>
</ul>
<h4>Key Features</h4>
<ul>
<li>Promote custom linked products (upsells, cross-sells) & related products</li>
<li>Automatically generate custom linked products for bulk items</li>
<li>Multiple sources: all products, products, brands, collections, types, visibility, tags, categories, attributes, shipping classes</li>
<li>Creating rules for the display: item limit, product filters: order by & order</li>
<li>Multiple rules can be set for the same item: rules’ order matters</li>
<li>Compatible with <a href="https://wordpress.org/plugins/wpc-custom-related-products/" rel="ugc">WPC Custom Related Products for WooCommerce</a></li>
<li>Compatible with most common WordPress themes and WooCommerce add-ons</li>
<li>Premium: Combine different sources to define the main & linked products</li>
</ul>
<h4>Distinguish between Related Products, Upsells & Cross-sells</h4>
Related products are displayed on the single product page where, in most cases, written “Related products” to promote products that share the same tags or categories with the main item that is being viewed.
Upsells are products that come in a higher, better version than the one being viewed. Upsells are often considered the “upgraded” version of the current one with better quality and a higher price. When placed together, customers might end up comparing and choosing to buy a more expensive item.
Cross-sells are complementary products that are often bought with or can go well with the main item. Customers can choose to purchase a combo of items to enjoy the discount or get better suggestions of what will come in handy when they purchase more items. Cross-sell products are displayed on the mini-cart and cart page to remind buyers of what they might have forgotten to get.
If you use the WPC Custom Related Products plugin, you can find the Related products tab on the single product page to customize the item list. Linked products can be found on the Linked products tab. The global rules can be configured from under the WPClever menu.
<h4>Which to use?</h4>
When you need to automatically create related products from items that share the same tags or categories or define a hand-picked list of choices, you can use the WPC Custom Related Products plugin.
When you need to take it to a higher level by suggesting more discounts when people purchase the related products alongside the main one, you can use the WPC Frequently Bought Together plugin and make related products the default products for a Bought Together deal.
When you need to create a custom list of upsells or cross-sells and attach to different products at the same time in bulk, you can use this WPC Smart Linked Products plugin to deal with that.
<h4>Need more features?</h4>
Please try other plugins from us:
<ul>
<li><a href="https://wordpress.org/plugins/woo-smart-compare/" title="WPC Smart Compare" rel="ugc">WPC Smart Compare</a></li>
<li><a href="https://wordpress.org/plugins/woo-smart-quick-view/" title="WPC Smart Quick View" rel="ugc">WPC Smart Quick View</a></li>
<li><a href="https://wordpress.org/plugins/woo-smart-wishlist/" title="WPC Smart Wishlist" rel="ugc">WPC Smart Wishlist</a></li>
<li><a href="https://wordpress.org/plugins/wpc-smart-notification/" title="WPC Smart Notification" rel="ugc">WPC Smart Notification</a></li>
<li><a href="https://wordpress.org/plugins/wpc-ajax-add-to-cart/" title="WPC AJAX Add to Cart" rel="ugc">WPC AJAX Add to Cart</a></li>
</ul>

WPC Smart Linked Products – Upsells & Cross-sells for WooCommerce

WPC Smart Linked Products plugin simplifies managing related, upsells, and cross-sells products in bulk with custom rules and mixed combinations.

Random Related Posts Based on Category vs WPC Smart Linked Products – Upsells & Cross-sells for WooCommerce