arsho

WP-Smooth-Scroll is a plugin that helps users to scroll smoothly to top of the page.
Main features of WP-Smooth-Scroll are:
<ul>
<li>WP-Smooth-Scroll is simple to set up and use.</li>
<li>It has options to select the position of WP-Smooth-Scroll button.</li>
<li>It wont create problem in smaller screen like mobile or tablet.</li>
<li>It is smooth and dynamic.</li>
<li>WP-Smooth-Scroll has an eye catching effect with nice hover effect.</li>
</ul>
Plugin Demo: <a href="http://shovon.info/wp/wp-smooth-scroll" rel="nofollow ugc">Plugin Support</a>

WP-Smooth-Scroll

WP-Smooth-Scroll is a plugin that helps users to scroll smoothly to top of the page.

dwieeb

This plugin will display an icon in a corner of the page that, when clicked, will smoothly scroll the user’s browser to the top of the page. The plugin comes with options such as which corner the icon should appear in, the distance from the corner, and which icon to use (you can also upload your own). Also, you can turn on the document scroll event to fade the icon in and out when the user scrolls far enough down the page and up again.
Please note* This plugin may not display the icon in many mobile browsers due to some lack of support for position: fixed;
Looking for a ScrollTo Bottom plugin? Check out the <a href="https://wordpress.org/extend/plugins/scrollto-bottom/" rel="ugc">sister plugin</a>.

ScrollTo Top

Uses the jQuery plugin ScrollTo by Ariel Flesler to smoothly scroll the user's browser to the top of the page when the user clicks the image.

WP-Smooth-Scroll vs ScrollTo Top