yakuphan

Comment Approved Notifier sends an e-mail to your commenters when you approve their comments. It is a very simple plugin. There are no settings, options. It starts to work when you activate it.
<h4>Read Please</h4>
If you upgraded to WP 2.7 or WP 2.8, please, update v1.1 to v2.1 
It requires at least 2.7. If you use WP 2.6.5, please use version 1.1
Thanks!

Comment Approved Notifier

https://wordpress.org/plugins/comment-approved-notifier-extended/
Updated version of this plugin. forked.

Updated

The plugin sends an e-mail to your commenters when you approve their comments.

10Horizons Plugins

This plugin is for those who want to use or have already been using Formidable Forms for user registration and want a simple way to hold the registrations for admin approval.
Tested with Formidable Forms up to: Version 3.06.05 
Tested with Formidable Registration up to: Version 2.02.01
The Flow
<ol>
<li>
Admin creates user registration application form using Formidable Forms plugin.
</li>
<li>
User registers an account using the above form.
</li>
<li>
If admin turns on approval for the above form, user who registers will automatically have the role of pending, and they cannot login until admin approves their registration.
</li>
<li>
If admin approves a user registration, that user’s role will change from pending to what is already set on the form setting. The user will be notified by email to let them know their registration has been approved.
</li>
<li>
Likewise, if admin rejects a user registration, the user will be notified by email to let them know their registration has been rejected, and the user will be deleted. 
(Note: You can still see rejected user’s details in Entries section if you enable entries for your form, even after user has been deleted. Disable entries to not store user details after user is deleted.)
</li>
</ol>
Plugin Dependency
This plugin is an add-on for Formidable Forms. The following plugins are required for it to work:
<ul>
<li><a href="https://wordpress.org/plugins/formidable/">Formidable Forms</a> (free or PRO, but you usually have to get PRO to get Formidable Registration plugin too)</li>
<li><a href="https://formidableforms.com/downloads/user-registration/" rel="nofollow ugc">Formidable Registration</a> (also called WordPress User Registration add-on for Formidable Forms)</li>
</ul>
Support Questions, Bug Reports
Support questions should ideally be posted here on WordPress.org forum. Other types of questions, bug reports, inquiry relating to the plugin, should also be posted on the WordPress.org forum.
Plugin Customization
If you need further plugin customization to suit your website, please <a href="https://wproot.dev/contact/" rel="nofollow ugc">reach out to the developer directly</a>.

User Registration Approval for Formidable Forms

Allows admin to easily approve or reject user registrations that use forms built with Formidable…

Comment Approved Notifier vs User Registration Approval for Formidable Forms