Animate.css
Just-add-water CSS animations
Magic Animations
Animations has been one of the most impressive animation libraries available
Zdog
Round, flat, designer-friendly pseudo-3D engine for canvas & SVG
AutoAnimate
AutoAnimate is a zero-config, drop-in animation utility that adds smooth transitions to your web app.
Hover.css
Hover.css is a CSS animation library designed for use with buttons and other UI elements in your website
Animista
CSS Animations On Demand
Loading.io
Ajax Loader, Animated Icons, Live Background ... in GIF / SVG / APNG / CSS !
Whirl
CSS loading animations with minimal effort!
CSS Loaders & Spinners
This is a library having a collection of different types of CSS loaders, spinners, loading
Useanimations
Animated icons in Lottie Framework for immediate implementation to your apps or websites.
AnimXYZ
AnimXYZ helps you create, customize, and compose animations for your website. Built for Vue, React, SCSS, and CSS
Motion One
A new animation library, built on the Web Animations API for the smallest filesize and the fastest performance.
AOS
Animate On Scroll Library.
Animatopy
Just-add-water CSS animations snippets
Awesome-web-effect
A series of exquisite and compact web page cool effects
Getloaf - Tools
You can make animated icons/illustrations with this tool
Thoughtbot - learn
CSS Transitions and Transformations for Beginners