AngularJS - HTML enhanced for web apps!
Helping you select an MV* framework - Todo apps for React.js, Ember.js, Angular, and many more
Build modern apps using web components
The aurelia framework brings together all the required core aurelia libraries into a ready-to-go application-building platform.
Reactive Flux built with ImmutableJS data structures. Framework agnostic.
Give your JS App some Backbone with Models, Views, Collections, and Events
Dojo 1 - the Dojo 1 toolkit core library. Dojo 2 is coming, checkout https://dojo.io/.