Stuart Bates

WP Responsive Images once activated automatically detects mobile devices viewing your website and serves up images of appropriate size 
by dynamically resizing images and caching them for improved performance.

WP Responsive Images

WP Responsive Images detects mobile devices and dynamically serves up smaller image sizes to improve page load times and user experience

Elvin D

Mobile Navigation Menu is a sophisticated plugin to automatically create a mobile menu version for your existing themes for a very simple configuration. If you are not satisfied with the looks of your current mobile navigation menu or not even have a mobile menu version, this is your solution.
A simple and lightweight Responsive Web Design plugin that automatically pops your mobile navigation menu in a breakpoint set.
<h4>Features and Usage</h4>
Few of the many features:
<ul>
<li>Make Mobile Menu for Your Existing Theme</li>
<li>Slide Navigation Like an Iphone. See Screenshots</li>
<li>Set your Breakpoint. MNMenu pops!</li>
<li>Pick your Desired Background, Icon, and Text Color</li>
<li>You can upload your Company Logo</li>
<li>Font Awesome Installed. (You can disable this feature via admin)</li>
<li>Hide/Show Admin Menu</li>
<li>Can Customize Image Loader</li>
<li>..and More</li>
</ul>
More usage, demo, and documentation can be read on <a href="http://www.innovedesigns.com/wordpress/plugin/mobile-navigation-menu/" title="DEMO" rel="nofollow ugc">DEMO</a>
If you like this plugin, good ratings is much appreciated. You can also Follow Me at <a href="https://twitter.com/esstat17" title="@esstat17" rel="nofollow ugc">@esstat17</a>.
Best coding practices was applied to this plugin by strictly following the WP Docs, this will be available on Github soon.
For more information or discussion please visit <a href="http://www.innovedesigns.com/" title="InnoveDesigns.com" rel="nofollow ugc">InnoveDesigns.com InnoveDesigns.com</a> and leave a message via our contact form for further concerns.
Comes from the code snippet <a href="http://mmenu.frebsite.nl/" title="MMENU" rel="nofollow ugc">MMENU</a> but it was made lightweight and simple.

Mobile Navigation Menu

Make your Navigation Menu Responsively Awesome! Themes that have no supported mobile navigation menu or not fine looking mobile menu version, this you …

WP Responsive Images vs Mobile Navigation Menu