Evan Solomon

Usually when we talk about making something responsive, we mean horizontally. But it’s annoying when tall images overflow a short laptop screen. This resizes those images on the fly to fit the user’s window. Optionally disable it for individual images by adding a <code>do-not-resize</code> class.

Vertically Responsive Images

Resize images on the fly to make sure the whole thing fits into the user's window.

Nicolas Juen

This plugin generate images with attributes for the responsive images in your content. 
Choose the breakpoints and the sizes associated. 
The next images you will insert and the elements generated with the wp_attachement functions will begenerated with the right attributes.
Contribute on https://github.com/Rahe/Simple-responsive-images 
Based on http://www.grahambird.co.uk/lab/doubletake/ for javascript

Simple Responsive Images

This plugin generate images with attributes for the responsive images in your content.

Vertically Responsive Images vs Simple Responsive Images