Marcin Pietrzak

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

DigitalCourt

Responsive Boxed Content Shortcodes
This easy to use boxed content shortcodes generates an fluid width boxed content that maximizes the width of the container.
Options you can set are: 
– Color 
– Height 
– Opacity
Please see Frequently asked questions for shortcode usage.
This plugin was created as part of the <a href="http://themersclub.com/marketer/shortcodes/box" rel="nofollow ugc">Marketer WordPress business theme</a>

Boxed Content

Add a mobile friendly fluid width Boxed Content with an easy to use shortcodes

upPrev vs Boxed Content