Anime.js : Anime.js is a fast, multipurpose and lightweight JavaScript animation library with a simple, yet powerful API.
It works with CSS properties, SVG, DOM ...
Woah.css : CSS Animation Library for eccentric web developers.
AOS : Animate On Scroll Library.
Small library to animate elements on your page as you scroll.
Diagnostic.css : Diagnostic.css is a stylesheet which allows the user to test for common errors in a page's markup.
Also : https://github.com/karlgroves/diagnostic.css
Fontdeck : Fontdeck is standards compliant, accessible and uses a pure CSS @font-face solution. No JavaScript required.
Animate.css is a bunch of cool, fun, and cross-browser animations for you to use in your projects.