Firdaus Zahari

This plugin allows you to track all user devices used when logging in to your site. The user agent, login date/time, and logout date/time (if the users log out from the site) are tracked automatically and persisted into the database for later viewing.
You can find a list of all login devices available under the Users > Login Devices submenu.

FS Login Devices

Track and display all users devices used during authentication process

moallemi

the Advanced User Agent Displayer plugin displays the Browser and the operating system of people who commnet on your blog. 
Currently Support for Desktop and moblie operationg systems and browsers. 
Browsers: Internet Explorer, Opera, Firefox, Safari, Chrome, Epiphany, Avant, Maxthon, Konqueror and … 
Platform: Windows (2000, XP, Vista, 7), Linux, Mac, iPhone and …
What’s New in version 2.7.5.2
<pre><code>* Added support for wordpress 4.5
</code></pre>
Translations
<ul>
<li>Persian – <a href="http://www.moallemi.ir/" rel="nofollow ugc">Reza Moallemi</a></li>
<li>French – <a href="http://www.wptrads.fr/" rel="nofollow ugc">Wolforg</a></li>
<li>German – <a href="http://ppfeufer.de" rel="nofollow ugc">Pfeufer</a></li>
</ul>

Advanced User Agent Displayer

Hello dear,
This plugin broke my site. From Author box description to footer </html> everything disappeared in source code. 
Regards,
Gulshan

Broke my site

This wordpress plugin adds user agent information to your blog comments by adding browser and platform icons and lets visitors know the user agent of  …

FS Login Devices vs Advanced User Agent Displayer