jQuery Pjax
pushState + ajax = pjax
Backbone Associations
Create object hierarchies with Backbone models; Respond to hierarchy changes using regular Backbone events.
Radio
Dependency-free Chainable Publish/Subscribe Library for Javascript
Imagesloaded
JavaScript is all like "You images done yet or what?"
Webshim
Webshims Lib is a modular capability-based polyfill-loading library
Stampit
Create objects from reusable, composable behaviors.
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Flakes
Flakes is an Admin Template Framework. A combination of CSS Libraries, JavaScript Libraries and Design files that help you build business tools very quickly.
Ethvtx
🌀Ethereum-Ready & Framework-Agnostic Redux Store Configuration
UI Router
The de-facto solution to flexible routing with nested views
Node Browserify
browser-side require() the node.js way
Almond
A minimal AMD API implementation for use after optimized builds
Frontless
Build universal JS applications with Riot.JS
Angular.js
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly
Amplify
AmplifyJS is a set of components for data management and application communication.
Backbone Marionette
Make your Backbone.js apps dance with a composite application architecture!
Webix
Stable releases of Webix UI - JavaScript library for building mobile and desktop web apps