I've seen complex animations on cloneable sites found on Webflow. It's a great place to gather ideas until a more advanced animation library becomes available.
These are the only ones I know of, but even these appeared in the last few weeks or months, so I'm sure we'll start to see a few more options on the horizon.
Relume Do you plan on incorporating an animation library in the near future? This would be a great addition to the subscription service. I've started to see a few sites that offer this, such as the following:
https://www.microinteractions.co/https://www.gfluo.com/