exclusiveitech

This plugin will automaticaly add a scroll to top on bottom right.

EIT Scroll to top

Good Effort

This plugin will automaticaly add a scroll to top on bottom right.

Skysa

A Scroll-to-top button for scrolling up to the top of the current page. Customize the label and icon used for the button. When the app button is clicked the page scrolls to the top with a smooth eased animation. The Scroll-to-Top button displays on a Skysa bar at the bottom of your site.
http://www.youtube.com/watch?v=Zj1uGXX2xrk&hd=1 
<a href="https://wordpress.org/extend/plugins/tags/skysa-apps" rel="ugc">More Skysa App plugins</a> -|||- <a href="https://wordpress.org/extend/plugins/skysa-official/" rel="ugc">Skysa App Bar Integration plugin</a>

Skysa Scroll-to-Top App

Animated scroll-to-top, button floats unobtrusively at the bottom of your site. A great convenience feature for your visitors.

EIT Scroll to top vs Skysa Scroll-to-Top App