Roy Tanck

This plugin will help you:
<ol>
<li>Find plugins and themes that are not active on any blog.</li>
<li>Determine the impact in case a theme/plugin needs to be upgraded, removed or reconfigured.</li>
<li>See if a widget is in use on any blogs, and track down where.</li>
<li>Find users who do not have a role on any site (and are not network administrators).</li>
</ol>
This plugin currently does nothing on single-site WordPress installs.

Network Admin Assistant

Helps you manage a WordPress network by displaying useful statistics.

Boone Gorges

CUNY Academic Commons

If you run a WordPress or BuddyPress installation, you probably know that some of the biggest administrative headaches come from the activation process. Activation emails may be caught by spam filters, deleted unwillingly, or simply not understood. Yet WordPress itself has no UI for viewing and managing unactivated members.
Unconfirmed creates a Dashboard panel under the Users menu (Network Admin > Users on Multisite) that shows a list of unactivated user registrations. For each registration, you have the option of resending the original activation email, or manually activating the user.
Note that the plugin works for the following configurations: 
1. Multisite, with or without BuddyPress 
2. Single site, with BuddyPress used for user registration
There is currently no support for single-site WP registration without BuddyPress.

Unconfirmed

Googled for "wordpress cancel pending users", this plugin can up as one of the top results, so installed, activated, and achieved exactly what I needed, inside of about 30 seconds. Literally perfect.

Did exactly what I needed

Nice, simple little plugin that makes it easy to get a user up and running when you have, for example, email deliverability issues.

Works as advertised

Thank you for this plugin. Not sure why such a feature isn't already part of Core, as it's very useful when managing a multisite!

This should be part of WP Core!

Work on WP 5.8.4 multisite

Allows WordPress admins to manage unactivated users, by activating them manually, deleting their pending registrations, or resending the activation em …

Network Admin Assistant vs Unconfirmed