Polymer

An open-source JavaScript library for building apps via web components; developed by Google and used by a number of Google services, e.g. YouTube Gaming, Google I/O websites, Google Play Music. 

First released2015
Developed byGoogle
Latest stable versionPolymer 3.0
Open-sourceYes
Used byGoogle, BBVA, Coca-Cola, Comcast, USA Today, ING

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