WP Scroll to top is beautifully designed and supper plugin.Very easy to use and perfect functionality.

Easily create and manage a page scroll to top

Scroll To Top plugin does the job with just one click a button appears when a person scrolls to the middle of the page to be clicked on.

99+ Pre Designs allows the visitor to easily scroll back to the top of the page, also navigate to the specific "ID" or "class".