Lottie is an open source plugin for Adobe After Effects and library from Airbnb allowing you to utilize After effects vector effects animations as easily as static images.
The Lottie exporter exports your After Effects animations in JSON format and the Lottie library supports an extensive number of After Effects features.
This animation from the readme shows several animations using Lottie:
You can download the Bodymovin plugin for After Effects so you can export animations in the JSON format on the Airbnb design site.
You can find the Lottie library source code on Github here.
You can read more about Lottie on the Airbnb design site here.
A great library and plugin for creating animations for iOS apps.
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