Ramoonus

<p>This plugin adds the Modernizr to your WordPress installation.<br />
Modernizr is a small JavaScript library that detects the availability of native implementations for next-generation web technologies, i.e. features that stem from the HTML5 and CSS3 specifications. Many of these features are already implemented in at least one major browser (most of them in two or more), and what Modernizr does is, very simply, tell you whether the current browser has this feature natively implemented or not.</p>
<p>For documentation visit http://www.modernizr.com/docs/</p>


Modernizr for WordPress

The 2.8.4 version inserts broken javascript link.  I posted a message about this in the support section for the plugin and the author has not responded or fixed the problem.  Now, any site that I've added this plugin to can be broken if the user runs an update.  

Instead, if you need Modernizr, insert the following into your header.php file just after <?php wp_head(); ?>:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.3/modernizr.min.js"></script>

Doesn't work - Plugin Defunct

This plugin adds the Modernizr to your WordPress installation.

NerdCow

<p>It shows nice pop up encouraging to upgrade or change current browser to get better performance while surfing the Internet. Template is easily configurable if someone doesn’t like the default one 🙂</p>
<p>GET BYE IE PRO PLUGIN COMPATIBLE WITH THE LATEST WORDPRESS 4.0+ VERSION HERE https://nerdcow.co.uk/downloads/bye-ie-pro/</p>


Bye IE

Plugin allows you to disable access to your website in chosen Internet Explorer versions.

Modernizr for WordPress vs Bye IE