Stephanie Leary

This new template tag generates a list of registered users. The post author and users who have commented on the post are crossed off the list; any users who have not yet commented are left alone.
Options:
<ul>
<li>exclude the admin user</li>
<li>choose the minimum user role to be show in the list (e.g. Contributor, Author, etc.)</li>
<li>sort the list by user ID, display name, first name, last name, or login</li>
<li>choose the categories in which to show the list</li>
</ul>
This plugin requires PHP 5.10.

Comment Author Checklist

This new template tag generates a list of registered users. The post author  and users who have commented on the post are crossed off the list.

royalnavneet

<ul>
<li>Website Comment Cleaner – Delete All Comments, Disable Comments, Bulk Delete & Remove Comments** helps you delete, export, import, and disable comments on your WordPress site using an admin dashboard with bulk actions and filters.</li>
</ul>
This plugin supports: 
* Deleting comments by status (approved, pending, spam, trash, or all). 
* Optional date-range filtering when bulk deleting. 
* Exporting comments to CSV and importing comments from CSV. 
* Disabling comments globally or by selected post types. 
* Role-based exclusions and scheduled spam cleanup.
<h3>Features</h3>
<ul>
<li>Export comments to CSV from the plugin dashboard.</li>
<li>Import comments from CSV.</li>
<li>Schedule automatic spam cleanup (daily, weekly, monthly).</li>
<li>Configure role-based exclusions and post-type comment settings.</li>
</ul>

Comment Cleaner — Bulk Delete & Disable Comments

Delete, export, import, and manage WordPress comments with bulk tools and comment-control settings.

Comment Author Checklist vs Comment Cleaner — Bulk Delete & Disable Comments