Plugins
Smooth Scrolling for Elementor v1.0.0.1
Smooth page scrolls followed by triggered images/media with parallax effect.
Plugins
Smooth Scroll for WordPress v3.0.3 - Site Scrolling without Jerky and Clunky Effects
Smooth Scroll plugin will make your WordPress site cool by making the scroll movement of the mouse wheel smooth.
Plugins
Smoother - Smooth Scrolling for WordPress v2.0.3
This Simple and Powerful WordPress Plugin will help to make Scrolling on your site really Smooth.