Arefly

Need some boxs to make your post better?
Now you can use this plugin to add Useful Boxes to your blog!
You just need to type the shortcode <code>[box]</code> in to your post and everything will done for you!
For shortcode usage please visit “Dashboard” -> “Tools” -> “Shortcode Box”
Live Demo: <a href="http://demo.arefly.com/wordpress/shortcode-box/" rel="nofollow ugc">Click Here</a>
中文介紹請看<a href="http://www.arefly.com/shortcode-box/" rel="nofollow ugc">這裏</a>
<h4>Translators</h4>
<ul>
<li>Chinese, Simplified (zh_CN) – <a href="http://www.arefly.com/" rel="nofollow ugc">Arefly</a></li>
<li>Chinese, Traditional (zh_TW) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
<li>English (en_US) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send <a href="https://codex.wordpress.org/Translating_WordPress" rel="nofollow ugc">gettext PO and MO files</a> to <a href="http://www.arefly.com/about/" rel="nofollow ugc">Arefly</a> so that I can bundle it into Shortcode Box. You can download the latest <a href="https://plugins.svn.wordpress.org/shortcode-box/trunk/lang/shortcode-box.pot" rel="nofollow ugc">POT file</a>.

Shortcode Box

Add Useful Boxes to your blog simply by shortcode.

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.

Shortcode Box vs upPrev