Free Animation on Scroll Library
AOS is by far my favorite on Scroll Library because of how easy it is to use and the lightweight of the package.
You can call the plugin as simple as one script and initiate it with one linke. Take a look at this.
<link href="https://cdn.rawgit.com/michalsnik/aos/2.1.1/dist/aos.css" rel="stylesheet"> <script src="https://cdn.rawgit.com/michalsnik/aos/2.1.1/dist/aos.js"></script> <script> AOS.init(); </script>
If you want to do an animation for a certain div you can do the following:
It also has a ton of Built in Animations
Check the Full Documentation: https://github.com/michalsnik/aos
Download Source: https://github.com/michalsnik/aos/archive/master.zip