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.

YAHMAN

ZIPANG

Enclose the main points in a frame to make them stand out.
Other Credits
This plugin uses some icons from <a href="https://fontawesome.com" rel="nofollow ugc">Font Awesome</a>. 
License – (https://fontawesome.com/license/free) 
(Icons: CC BY 4.0 License , Fonts: SIL OFL 1.1 License , Code: MIT License)

Point Maker

Make a frame that can be easily used for the main points.

upPrev vs Point Maker