CxJS is a now open-source, plug-n-play Javascript framework for developing complex and data-rich applications fast.
It's been in development for 5 years, and now it's free under the MIT license with its set of widgets, charts, themes, demo applications, documentation and tools.
You can read more about it here:
https://blog.codaxy.com/cxjs-goes-open-source-f52fee2a8214