Ponyfill for upcoming Element.scrollIntoView() APIs like scrollMode: if-needed, behavior: smooth and block: center. When deciding if scrolling is needed the visibility of the target element is checked. If it's less than 100% it will be scrolled.

Declarative on-scroll reveal animations.

lightweight jQuery plugin for fade-as-you-scroll features

Extremely customizable 3kb plugin for scroll based animation which animates 1000 elements without lags

Scrollsnap allows to define 'anchor points' onto which the window snaps when you scroll through a web page or parts of it.

Detection of elements in viewport & smooth scrolling with parallax effects.

Locomotive Scroll @ GitHub.

smart scrolling plugin.

Light Weight "Headroom Style" scroll intent library that hides the site header on scroll down and shows on scroll up.

A lightweight JavaScript library for creating smart header behavior based on scroll intent. Peek automatically hides your site header when users scroll down and reveals it when they scroll up, creating a more immersive browsing experience.

• Peek @ GitHub.