Worbee Ltd

This plugin collects actions performed by existing WordPress users and shows that data in an easy-to-process table.
The plugin won’t track guests (non-logged visitors) of your website. 
It does not create any additional cookies. You may want to inform your registered users that some of their actions are being stored. This includes any type of visitors that have an account within your WordPress installation. 
No user information is being sent outside of your installation.
The statistics are available to Administrators only by default.
Use cases:
<ul>
<li>check if your users have logged in recently</li>
<li>check who is most active</li>
<li>verify that your editors and authors are editing content</li>
<li>monitor which content is being worked on</li>
</ul>
<h3>Simple:</h3>
<ol>
<li>Login to your WordPress dashboard.</li>
<li>Navigate to Plugins -> Add new</li>
<li>Search for <code>User Stats WP</code></li>
<li>Install</li>
<li>Activate</li>
</ol>

User stats WP

Stores and displays user generated events, like logins and post edits.

User stats WP vs Koko Analytics – Privacy Friendly Statistics for WordPress