Jeremy Shantz

I made this plugin to help with internal linking on existing sites, existing published content. 
Please feel free to donate if you like my plugin, it will help me feed my dogs and inspire me to add more functionality.
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<h3>Usage</h3>
Here’s how it works:
You’ll find the plugin under the WordPress Settings menu.
Click on the plugin in the settings menu, and a user screen will appear where you can select (via dropdowns) either a single article or an article category target.
Next, you can select whether or not to include a link to your selected pillar post or page. If you choose Yes, select your preferred pillar post or page from the dropdown.
When you click the button to proceed, the plugin works as follows after selecting either a single article or a category.
a)The plugin will retrieve all the articles in the same category as either the single article you selected or the category you selected. 
b)The plugin will randomly select 6 articles in the same category and create an HTML heading and list of linked titles. It then adds this list to either the end of the single article or performs the same action on all articles in the category selected. 
c)If you selected Yes for pillar content, and you’ve selected the target post or page as the pillar, the plugin will proceed to add the title of your selected post or page as a bolded first item of the links list.
<h3>Donate</h3>
Support the development of this plugin by making a donation: https://www.paypal.com/donate/?hosted_button_id=RRN3SPBMJZT4G

Add Internal Links Lite

Add internal links to the end of a selected article's content or all articles in a selected category.

Mevabi

Mevabi – Related Posts Inline lets you automatically insert related posts directly inside your post content — not just at the bottom. Keep readers engaged by surfacing relevant content right where their attention is.
<h4>Key Features</h4>
<ul>
<li>Two placement modes — Insert related posts at the end of the content, or distribute them inline evenly throughout paragraphs.</li>
<li>Three modern layouts — Choose the style that fits your theme:
<ul>
<li>Design 1 · Solid + Arrow — Full-color card with a large right-hand arrow CTA. Section title displayed above the box.</li>
<li>Design 2 · Grey · Centered — Subtle light-grey card, centered text, section title inside the box. No arrow.</li>
<li>Design 3 · Image + Arrow — Same as Design 1 but with the featured image displayed on the left side of the card.</li>
</ul>
</li>
<li>Fully clickable cards — The entire card area is a single link; no awkward partial click zones.</li>
<li>Per-design color customization — Every color (background, hover, title, excerpt, arrow, section label, border, border-radius) is individually configurable via native color pickers in the admin.</li>
<li>Optional post excerpt — Show a short, clean text excerpt (shortcodes and HTML stripped automatically). If the post begins with a shortcode it is skipped and the first real text paragraph is used instead.</li>
<li>Typography controls — Set font sizes (in any CSS unit) for the section title, post title, and excerpt independently.</li>
<li>Match by category or tags — Choose which taxonomy drives the “related” logic.</li>
<li>Link target — Open related post links in the same tab or a new tab (with proper <code>rel="noopener noreferrer"</code>).</li>
<li>Section title — Define a custom heading shown above (or inside) each related posts block.</li>
<li>1–3 posts — Display one, two, or three related posts per block.</li>
<li>Lightweight — No jQuery, no external libraries; vanilla JS + a single small CSS file.</li>
</ul>
<h4>Privacy</h4>
This plugin does not collect, store, or transmit any personal data.

Mevabi – Related Posts Inline

Display related posts inline within your content or at the end, with three modern designs and full color customization.

Add Internal Links Lite vs Mevabi – Related Posts Inline