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See the following -

Facebook Makes The Animation Library Behind Paper Open Source

Lauren Hockenson | GIGAOM | April 28, 2014

The animation generator behind Facebook’s Paper will now be available as open source for mobile developers...The company plans to announce today that the animation engine behind Paper, Pop, will be available to developers as an open source tool.

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Facebook Rebooting Their Open Source Contributions

Jason Hibbets | OpenSource.com | April 7, 2014

Facebook is on a new open source journey. They're managing hundreds of active open source projects across the company and over the last nine months, have rebooted how they run those projects.

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