windyjonas

Get an overview of how active your users has been during a specified time period. This plugin will list all the users, 
the number of posts/pages they have created and when their latest post was created.
You can sort all the columns, filter by post type and search for a specific user name.
Note: This plugin uses the WP_List_Table, even though it is marked as @access private in WordPress core.
Plugin header image: 
<a href="https://www.flickr.com/photos/karen_roe/8655075297" rel="nofollow ugc"><img loading="lazy" decoding="async" src="https://live.staticflickr.com/8119/8655075297_212ce2c750_z.jpg" alt="The Big Egg Hunt 2013 - Covent Garden, London" width="640" height="427" /></a> 
Cropped to fit 
License: https://creativecommons.org/licenses/by/2.0/

User Activity

List number of posts per user. You can limit the search by date, post type and user name.

Juergen Schulze

A plugin for wordpress which allows you to send an email to the registered blog users. Users can send personal emails to each other. Power users can email groups of users and even notify group of users of posts.
With ability to schedule mails of the newest post in digest form.
! ! ! S T I L L B E T A ! ! !
All the instructions for installation, the support forums, a FAQ, etc. can be found on the <a href="http://1manfactory.com/emu2" rel="nofollow ugc">plugin home page</a>.
This plugin is available under the GPL license, which means that it’s free. But a “thank you” on my blog is highly apprechiated.
Check out my other <a href="https://wordpress.org/extend/plugins/profile/1manfactory" rel="ugc">WordPress Plugins</a>
<h3>Remove plugin</h3>
<ol>
<li>Deactivate plugin through the ‘Plugins’ menu in WordPress</li>
<li>Delete plugin through the ‘Plugins’ menu in WordPress</li>
</ol>
It’s best to use the build in delete function of wordpress. That way all the stored data will be removed and no orphaned data will stay.
<h3>To do</h3>
More translations. Does someone wants to help?

Emu2 – Email Users 2

Send email to users, manually or on schedule (digest of newest posts).  Users can send emails to each other. Export function included. STILL BETA!!!

User Activity vs Emu2 – Email Users 2