History.js
History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. Supports jQuery, MooTools and Prototype. For HTML5 browsers this means that you can modify the URL directly, without needing to use hashes anymore. For HTML4 browsers it will revert back to using the old onhashchange functionality.
Aura
A scalable, event-driven JavaScript architecture for developing widget-based applications. Works with Backbone.js and other frameworks.
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
RequireJS
A file and module loader for JavaScript
Redhooks
Predictable state container for React apps written using Hooks
Polished
A lightweight toolset for writing styles in JavaScript ✨
Batman
Fighting Crime and Kicking Apps
Node Browserify
browser-side require() the node.js way
Mustache.js
Minimal templating with {{mustaches}} in JavaScript
YUI3
YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
Tangle
a JavaScript library for reactive documents
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
UA Parser
Lightweight JavaScript-based User-Agent string parser. Supports browser & node.js environment. Also available as jQuery plugin.
Handlebars.js
Handlebars provides the power necessary to let you build semantic templates effectively with no frustration. An extension to the Mustache templating language created by Chris Wanstrath.
Mousetrap
Simple library for handling keyboard shortcuts in Javascript
Durandal
A cross-device, cross-platform client framework written in JavaScript and designed to make building Single Page Applications (SPAs) easy to create and maintain.
Rambda
Faster alternative to Ramda in just 10kB