ryokurosu

This is keyword rank checker in Classic Editor.You could view top rank contents rapidly.
This tool displays the title, the number of characters, and the headline of the content above the search order of the specified keyword, and helps you create the content.
Understanding what kind of headline articles appear at the top helps you with ideas for similar content and original content.
It is hard to open various tools while opening WordPress, but if this plug-in is inserted, everything will be completed in the editor.
Add-ons allow you to see in more detail the features and top-view content you can add headings with a single click.
This plugin:
<ul>
<li>You can search top rank contents in each keyword.</li>
<li>Get information from Google “Custom Search JSON API” and display it.</li>
<li>If you want to know more about “Custom Search JSON API”, look at <a href="https://developers.google.com/custom-search/v1/overview" rel="nofollow ugc">this site</a>.</li>
<li>You have to comply with <a href="https://developers.google.com/custom-search/terms" rel="nofollow ugc">“Custom Search JSON API” terms of use</a>.</li>
</ul>

Nader

The “Most Comments” plugin displays as the name says posts with the most comments. You can either use the widget in the sidebar or integrate the plugin as template tag in your theme files.
Features:
<ul>
<li>Limit the amount of posts to be shown</li>
<li>Show comments from a specific post category</li>
<li>Exlude posts without comments</li>
<li>Select a time range (last XX days) of posts to be taken into account</li>
<li>Customize the design template via the settings page</li>
<li>Place a widget in your sidebar</li>
</ul>
More Information & Feature Description: 
http://www.brandinfection.com/wordpress-plugins/most-comments/
<h3>Configuration</h3>
You can configure the most comments plugin to your needs. Options can be found under the menu <code>Settings > Most Comments</code>

Most Comments

Display posts with the most comments, as a widget or on a page using the template tag. Customize the look with specific settings.

Top Rank Content Checker vs Most Comments