Dante Campbell

The DMN (Hush) plugin provides an easy way to disable comments on all post types in WordPress, including posts, pages, and custom post types. This is useful if you do not want to allow comments on your site, or if you want to disable comments for a specific period of time.
The plugin also removes all options related to comments from the WordPress dashboard, including the ability to enable comments on individual posts or pages. This helps to simplify the dashboard and prevent any confusion for users who may not be familiar with WordPress.
The DMN (Hush) plugin can be easily activated and deactivated from the WordPress dashboard, and requires no additional configuration or setup.

DMN (Hush)

The DMN (Hush) plugin allows you to disable comments on your WordPress site.

Stefano Lissa

Comment Notifier lets user to subscribe the comment thread of each single post of your blog. It improves traffic and loyalty.
Notification emails are fully customizable (both plain text or html) with a number of “tags” to insert author name, post link and title, receiver name and so on.
The “subscribe me” checkbox in the comment form area can be added automatically or manually.
Read more on <a href="http://www.satollo.net/plugins/comment-notifier" rel="nofollow ugc">Comment Notifier</a> offical page.
<h4>Other plugins</h4>
<ul>
<li><a href="https://www.satollo.net/plugins/hyper-cache" rel="nofollow ugc">Hyper Cache</a></li>
<li><a href="https://www.thenewsletterplugin.com" rel="nofollow ugc">Newsletter</a></li>
<li><a href="https://www.satollo.net/plugins/header-footer" rel="nofollow ugc">Header and Footer</a></li>
<li><a href="https://www.satollo.net/plugins/thumbnails" rel="nofollow ugc">Thumbnails</a></li>
<li><a href="https://www.satollo.net/plugins/include-me" rel="nofollow ugc">Include Me</a></li>
</ul>

Comment Notifier

Add comment subscriptions to the blog comment form.

DMN (Hush) vs Comment Notifier