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.

artifex404

View your site visits statistics at a glance: browsers, operating systems, visitors and much more!
Highly customizable settings to fine-tune the tracking. One click install and you are ready to go!
This lightweight plugin is carefully integrated in WordPress, which makes it fast, secure and reliable.
<a href="https://wordpress.org/plugins/wp-power-stats/screenshots/" rel="ugc">View sample screenshots</a>
Claim back your privacy: no third party services, all statistics are private on your hosting and are accessible only by you.
Charting is provided by Google Chart library, which does not collect any information.
Statistics features:
<ul>
<li>Page views</li>
<li>Devices</li>
<li>Traffic sources</li>
<li>Browsers</li>
<li>Operating systems</li>
<li>Geographical location</li>
<li>Search terms</li>
<li>Viewed posts</li>
<li>Referrers</li>
</ul>
Languages:
<ul>
<li>English</li>
<li>French</li>
<li>Spanish</li>
<li>Finnish</li>
<li>Hungarian</li>
<li>Russian</li>
<li>German</li>
<li>Portuguese</li>
<li>Catalan</li>
</ul>

WP Power Stats

I like this plugin very much. Plugin is Simple and easy to understand. Most things that I use are "Visitors & Page Views" graph and "Traffic Source".

Useful stuff!

What a pitty: search engine keywords stay empty.
And I know that there must be a lot of them because I crosscheck it with Google Webmaster Tools.

No search engine keywords

Discover your visitors in real-time, intuitively and with style.

User stats WP vs WP Power Stats