ES6
Replace CoffeeScript w/ ES6: classes, string interpolation, fat arrow functions, default arguments, splats, destructuring
ECMAScript 6 by Guillermo Rauch: module syntax, destructuring, scoping conventions, string interpolation, classes, fat arrow functions, promises
Ember.js
Ember Data
Ember.RSVP + jQuery
Flux
React
React.parts: directory of React components
Problems w/ React's licensing:
Performance
Brocolli.js plugins
https://github.com/moudy/broccoli-base64-css: Broccoli plugin to replace reference to images in CSS with base64 strings
https://www.npmjs.com/package/broccoli-asset-rev: Add fingerprint checksums to files and update source to reflect filenames
https://github.com/stephank/broccoli-bundle-assets: out-dated plugin? Inlines JS and CSS into HTML files
Widgets
jessepollak/card: make your credit card form better in one line of code: Animated credit card entry widget
Charting
D3.js-based
BriteCharts: D3.js V4 charting library, Introduced here
Other
Muze: Similar to Tableau's visualizations
Interesting
Reactive-Extensions/RxJS: The Reactive Extensions for JavaScript
Make your Website LibreJS-friendly with the rel=jslicense attribute.