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.

wpsimpletools

Completely disables comments functionality from backend and frontend: 
* Hides existing comments 
* Close comments on the front-end 
* Disable support for comments, trackbacks and ping 
* Redirects any user trying to access comments page 
* Removes comments metabox from dashboard 
* Removes comments links from admin bar 
* Removes comments page in menu 
* Completely disables comments API

Disable Comments

The type of plugin I just love... does exactly what it says, no configuration necessary, source readable and understandable in minutes.

Simple, effective, no config ✅

Completely disables comments functionality from backend and frontend. Just install it, nothing to configure!

Comment Author Checklist vs Disable Comments