Sal.js (Scroll Animation Library) is a performance focused, lightweight scroll animation library, written in vanilla JavaScript. It's based on the Intersection Observer.
Scrolling Letters Animation is a switching title effect where a fixed text element changes with an animation depending on the scroll position by using CSS and anime.js
Slice Revealer is a reveal effect where animated slices cover and uncover an image.
Anime.js for the animations and Intersection Observer API used for triggering the effects on scroll.
Scrollama is a modern & lightweight JavaScript library for scrollytelling using Intersection Observer in favor of scroll events.
Lozad.js is advanced performant Lazy Loader using Intersection Observer API.
It is written with an aim to lazy load images, ads, videos or any other element using the recently added Intersection Observer API with tremendous performance benefits.