Milan Dinić

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This plugin shows a message with link to signup page of Gravatar (pre-filled with e-mail address) to commenters and/or users who don’t have gravatar.
Message can be shown to:
<ul>
<li>unregistered commenters when they leave text input field for e-mail address</li>
<li>registered commenters to whom their registered e-mail address is checked</li>
<li>unregistered commenters after they post a comment in a dialog, to whom their entered e-mail address is checked</li>
<li>registered commenters after they post a comment in a dialog, to whom their registered e-mail address is checked</li>
<li>registered users in administration notices, to whom their registered e-mail address is checked</li>
<li>registered users in admin bar, to whom their registered e-mail address is checked</li>
<li>registered users on their profile page, to whom their registered e-mail address is checked</li>
<li>users who fill registration form when they leave text input field for e-mail address</li>
</ul>
Options are fully customizable. See FAQ for more information.
This plugin is lightweight, it adds only one field in database which is deleted if you uninstall plugin using WordPress’ built-in feature for deletion of plugins. Also it will only load jQuery file to head of your page if it wasn’t already loaded by theme or other plugin(s). Checks for gravatar are done via simple AJAX. 
If you want to speed up your web site and save on bandwidth and server resources, it is recommended that you also install plugin <a href="http://jasonpenney.net/wordpress-plugins/use-google-libraries/" rel="nofollow ugc">Use Google Libraries</a> which will load jQuery file from <a href="http://code.google.com/apis/ajaxlibs/" rel="nofollow ugc">Google AJAX Libraries</a>.
In order to plugin works, it needs to be on server with PHP 5 and on WordPress 2.8 or above.
<iframe loading="lazy" title="Gravatar Signup Encouragement Tutorial" width="750" height="563" src="https://www.youtube.com/embed/eIvm4rBkxPk?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

Gravatar Signup Encouragement

Shows a message with link to Gravatar's signup page to commenters and/or users without gravatar.

blueinstyle

Display your top commenters or authors in a widget, or you can display anywhere on your blog by pasting this code into your theme: <code><?php if(function_exists('jme_top_contributors')) { jme_top_contributors(); } ?></code>
Version 1.4 includes many user requested features. Check <a href="http://justmyecho.com/2010/07/top-contributors-plugin-wordpress/" rel="nofollow ugc">plugin webpage</a> for details on the update.
<ul>
<li>List your top commenters or authors with the option to display their Gravatar, and several other options.</li>
<li>Choose from 2 formats of the widget, with complete control of styles via css.</li>
<li>Exclude users from the list by email address.</li>
<li>The list uses a cache system for improved performance. List updates only when a post or comment is added, or options updated.</li>
</ul>
<h4>Extra Feature</h4>
<ul>
<li>Add a special Icon next to each of your Top Commenter’s name in their comments to give them a little special recognition for being a regular contributor.</li>
</ul>
Support and Feature request forum at http://justmyecho.com/forums/

Top Contributors

Display your top commenters or authors in a widget.

Gravatar Signup Encouragement vs Top Contributors