Facebook Open Sources More Of The Tech Behind Its Paper App

It doesn’t look like Facebook’s Paper app for iOS ever caught on with users, but many developers looked toward it as an example of what a modern mobile app could look like.

To write Paper, Facebook developed a wide variety of proprietary libraries, and it’s slowly making some of them available to outside developers. Earlier this year, for example, Facebook open sourced the Pop animation engine, which powers much of the user interface of the app, Shimmer for adding a shimmering effect to apps and a couple of other libraries it developed for Paper. Today, it is making the AsyncDisplayKit library available to developers, too.