Ben May

This plugin prevents imposters from leaving comments on your website with either the same name or email address as a registered user on your site.
This prevents users on the blog from being impersonated.

Duplicate Comment Authors

Prevents people posting comments using the same name as a registered users display name.

WPKube

Easily display a list or grid of post authors (or any other user role) and links to their post archives page using a shortcode.
Backend UI can be used to change all the options.
<blockquote>
Introducing New Authors List Pro
 The free version offers a large amount of features for free, and the PRO version comes with even more amazing features for your authors list. 
 Some of those features are Styler, Search and Filters. Styler allows easy change of color/typography/spacing on any of the elements in the authors list. Filters allow you to create a better organization of the authors list. Search allows your visitors to search for specific users. 
 <a href="https://www.authorslist.com/" rel="nofollow ugc">Click here to get the PRO version!</a>
</blockquote>
<h4>Shortcode</h4>
All the options are available in the WP admin but you can also use a plain shortcode (as it was in version 1 of the plugin). The shortcode is [authors_list] and accepts the following attributes.
<ul>
<li>style (1,2,3)</li>
<li>columns (2,3,4)</li>
<li>columns_direction ( horizontal, vertical )</li>
<li>avatar_size (any number, example 500)</li>
<li>amount (any number, no limit by default)</li>
<li>show_title (yes,no)</li>
<li>show_count (yes,no)</li>
<li>show_bio (yes,no)</li>
<li>show_link (yes,no)</li>
<li>orderby ( post_count, post_date, ID, login, nicename, email, url, registered, display_name, first_name, last_name )</li>
<li>order ( ASC, DESC )</li>
<li>skip_empty ( yes, no )</li>
<li>minimum_posts_count ( any number )</li>
<li>bio_word_trim ( any number, leave empty for no trim )</li>
<li>only_authors ( yes, no )</li>
<li>exclude ( user IDs separated by comma, example 1,3,4 )</li>
<li>include ( user IDs separated by comma, example 1,3,4 )</li>
<li>roles ( roles separated by comma, example administrator,editor )</li>
<li>latest_post_after ( for example if set to 7 it will only show authors that have posts published in the past 7 days )</li>
<li>name_starts_with ( limit to authors whose display name starts with specific characters )</li>
<li>first_name_starts_with ( limit to authors whose first name starts with specific characters )</li>
<li>last_name_starts_with ( limit to authors whose last name starts with specific characters )</li>
<li>categories ( category IDs separated by comma, example 1,3,4 )</li>
<li>terms ( term IDs separate by comma, example 1,3,4 )</li>
<li>taxonomy ( name of a taxonomy, for example post_tag )</li>
<li>title_element (the element that wraps the name of the user/author, defaults to div, can be any element, for example h2)</li>
<li>link_count (yes, no)</li>
</ul>
Example usage with attributes:
<pre>[authors_list style="2" columns="2" amount="4" show_count="no"]</pre>
There are additional attributes for custom content before and after each element:
<ul>
<li>before_avatar</li>
<li>before_title</li>
<li>before_count</li>
<li>before_bio</li>
<li>before_link</li>
<li>after_avatar</li>
<li>after_title</li>
<li>after_count</li>
<li>after_bio</li>
<li>after_link</li>
</ul>
Example usage with attributes:
<pre>[authors_list before_title="My custom content"]</pre>
These before/after attributes also support dynamic user/author meta fields using
<pre>{al:INSERT_FIELD_NAME}</pre>
Example usage:
<pre>[authors_list before_title="My first name is {al:first_name}"]</pre>
They also support some dynamic output functionality. Currently supports displaying posts links and social links (Yoast SEO needed):
Example usage for posts links:
<pre>[authors_list after_title="{alf:posts}"]</pre>
<pre>[authors_list after_title="{alf:posts type=plain amount=5}"]</pre>
Example usage for social links:
<pre>[authors_list after_title="{alf:social}"]</pre>
Example usage for roles:
<pre>[authors_list after_title="{alf:role}"]</pre>
Example usage for link (the “to” parameter accepts foollowing values: archive bbpress_profile buddypress_profile):
<pre>[authors_list after_title="{alf:link to=bbpress_profile}"]</pre>
Social Icons SVGs by <a href="https://fontawesome.com/license" rel="nofollow ugc">FontAwesome</a> are licensed under CC BY 4.0
<h4>What’s Next</h4>
If you like this plugin, then please consider leaving us a rating / review. This plugin is maintained by <a href="https://www.wpkube.com/" title="WordPress Themes Plugins Reviews" rel="friend nofollow ugc">WPKube</a>, a WordPress resource site, where you can learn from our in-depth guides such as 
<a href="https://www.wpkube.com/what-is-wordpress/" rel="friend nofollow ugc">What is WordPress</a>, <a href="https://www.wpkube.com/best-wordpress-hosting/" rel="friend nofollow ugc">How to choose a WordPress hosting</a>, & more!
<h4>Our Other Projects</h4>
<ul>
<li><a href="https://wordpress.org/plugins/optin-forms/" rel="ugc">Optin Forms</a>: Simple and easy to use plugin for creating optin forms, works with most well known autoresponder services.</li>
<li><a href="https://wordpress.org/plugins/simple-basic-contact-form/" rel="ugc">Simple Basic Contact Form</a>: Light-weight contact form plugin</li>
<li><a href="https://wordpress.org/plugins/subscribe-to-comments-reloaded/" rel="ugc">Subscribe to Comments Reloaded</a>: Email Notification plugin for Comments</li>
<li><a href="https://wordpress.org/plugins/advanced-excerpt/" rel="ugc">Advanced Excerpts</a>: This plugin adds several improvements to WordPress’ default way of creating excerpts.</li>
</ul>

Authors List

Excellent

Use a shortcode to display a list or grid of post authors (or any other user role) and links to their post archives page.

Duplicate Comment Authors vs Authors List