This Responsive WordPress slider plugin will allow you to drag two images left and right that is before and after.

swadeshswain

Using Before After Image Slider plugin you can create draggeable slider to wordpress page or post. 
This is only two image slider which contains before image and after image. and this slider is also responsive.it has a complete easy-to-use slide editor with different layers. Don’t hesitate install the Before After Image Slider and enjoy the next generation plugin experience!
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<a href="http://swadeshswain.com/demo/before-after-image-slider-wp/" rel="nofollow ugc">Demo sliders</a> | <a href="http://swadeshswain.com/demo/before-after-image-slider-wp/" rel="nofollow ugc">Documentation</a> | <a href="http://odrasoft.com/contact-us/" rel="nofollow ugc">Support</a>
</blockquote>
<h4>Features:</h4>
<ul>
<li>Before After Image Slider integrated with WordPress – media manager, shortcode, widget, post permalinks, post editor</li>
<li>Before After Image Slider is responsive and touch friendly – Sliders can be enjoyed in any environment, be it a mobile, tablet or desktop.</li>
<li>Before After Image Slider displayed with the shortcode – [bais_before_after before_image=”before_image_url” after_image=”after_image_url”]</li>
</ul>

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