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. 

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First released 2015
Developed by Google
Latest stable version Polymer 2.0.2
Open-source Yes
Used by Google, BBVA, Coca-Cola, Comcast, USA Today, ING
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Development by Synergize.digital