stesvis

Related articles by tag is a plugin that will display, after the post content, a list of links to posts that have the same tag. It is a great way to have the search engine index all your pages. 
You can tag pages as well so they can be part of the related articles. The plugin comes with a handy widget if you don’t want to use the shortcode. 
Use the shortcode [related-articles-by-tag] where you want the related articles to appear.
<h3>Known Issues</h3>
<ul>
<li>None at the moment.</li>
</ul>

Apoorv Dwivedi

Simple and fastest WordPress Plugin to add 3 related posts at the end of the blog post from same category.
Just Install the plugin and it is ready to go.
=Guranteed Fastest Plugin Ever To Show Related Posts=

i Relate

Simple WordPress Plugin to add 3 related posts at the end of the blog post from same category.

Related Articles by Tag Lite vs i Relate