ryokurosu

This plugin is easy to set category ranking. 
If you view the post,Ranking is on the same category.
This plugin:
<ul>
<li>Easy setting ranking widget on same category</li>
<li>Frontpage ranking is able to choose</li>
</ul>
Please contact me if you want additional setting.

Simple Category Ranking

this is a better way to ranking widget with category.

Kamal Hosen

This is a simple widget like others to show your most popular posts based on views of your post. Put it in any of your widget area from your WordPress dashboard and the it will automatically show 5 most popular posts which will be visited most after the activation of the widget.So, after activation of the widget, visit a post of your website and see, it will show below the popular post title.

Simple Category Ranking vs Popular Post Widget with Thumbnail