Animate.css is licensed under the MIT license. (https://opensource.org/licenses/MIT)
Pull requests are the way to go here. We only have two rules for submitting a pull request: match the naming convention (camelCase, categorized [fades, bounces, etc.]) and let us see a demo of submitted animations in a pen. That last one is important.
This project and everyone participating in it is governed by the Contributor Covenant Code of Conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to animate@eltonmesquita.com.