Marcin Pietrzak

<p>Display cool, animated fly-out or fade box with related content.</p>
<p>When a reader scrolls to the bottom of a single post, page, or custom post type, an animate box will be shown allowing the reader to select the previous or random available post or posts in the selected configuration:</p>
<ol>
<li>Just previous</li>
<li>Previous in category</li>
<li>Previous in tag</li>
<li>Random</li>
<li>Related using YARPP (only post/pages)</li>
</ol>


upPrev

Great plugin. Works great, lightweight and doesn't take a lot of resources to manage. 

Great Plugin

Display cool, animated fly-out or fade box with related content.

themifyme

<p>Use 16 Themify shortcodes with the free Themify Shortcodes Plugin.  We’ve taken all the same shortcodes available in our Themify themes, and placed it into this plugin to give everyone the ability to use it with any third-party WordPress theme. This plugin also comes with a shortcode generator on the text editor, allowing you to easily insert shortcodes without having to manually type it and its parameters.</p>
<p><a href="https://themify.org/themify-shortcodes/" rel="nofollow ugc">Working Demo</a> | <a href="https://themify.me/docs/shortcodes" rel="nofollow ugc">Shortcode documentation</a></p>
<h4>included shortcodes:</h4>
<ul>
<li>Button</li>
<li>Column</li>
<li>Horizontal Ruler</li>
<li>Quote</li>
<li>Logged In User Message</li>
<li>Guest User Message</li>
<li>Map</li>
<li>Video</li>
<li>Flickr</li>
<li>Twitter</li>
<li>Post Slider</li>
<li>Slider</li>
<li>List Posts</li>
<li>Box</li>
<li>Author Box</li>
<li>Icon</li>
<li>Icon List</li>
</ul>


Themify Shortcodes

Allows you to use all Themify shortcodes on any WordPress theme.

upPrev vs Themify Shortcodes