Lorna Timbah

This plugin creates a widget to show the top commentators in your WP site. Always go back to the Widget settings after each version update to Save your settings. Demo can be found at http://demo.webgrrrl.net
The Top Commentators Widget plugin is adapted from Show Top Commentators plugin at Personal Financial Advice, this widget is easier to manage via the control form (no need to edit the PHP file); additional options are also available to make it more flexible. Read the FAQ section on how to customize the widget. Read the Changelog as well as http://webgrrrl.net/tags/tcw for the latest news on this widget.
This widget is extensively tested with the following settings: Google Chrome 13.0.782.215 m, PHP 5.2.13, Apache 2.2.15 (Win32), MySQL 5.0.51a, WordPress 3.2.1. Further testing and bug report on this widget is greatly welcomed and appreciated.

Top Commentators Widget

Adds a sidebar widget to show the top commentators in your WP site. Demo: http://demo.webgrrrl.net

Venugopal

By default this plugin removes the comment date and gravatar. If you want to enable anything, go to this plugin settings and uncheck the checkbox.
More WordPress help please follow Me on this link 
<a href="https://venugopalphp.wordpress.com/" rel="nofollow ugc">Venugopal</a>

Comment Date and Gravatar remover

By default this plugin removes the comment date and gravatar. If you want to enable anything, go to this plugin settings and uncheck the checkbox.

Top Commentators Widget vs Comment Date and Gravatar remover