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

Louis

Super Browser Detector adds PHP user agent information to the body class to help target specific devices, browsers, and operating systems with CSS.
Major features in User Agent Body Class include:
<ul>
<li>Adds user browser and operating system information as a string to the body class.</li>
</ul>

Super Browser Detector

License: GPLv2 or later Super Browser Detector adds PHP user agent information to the body class

FS Login Devices vs Super Browser Detector