Then.js
The fastest, smallest, fully compatible, full-featured asynchronous module!
Cellx
Ultra-fast implementation of reactivity for javascript
JS Signals
Custom Event/Messaging system for JavaScript inspired by AS3-Signals
Invisible
Invisible.js: Reusable models for the client and the server
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Polished
A lightweight toolset for writing styles in JavaScript ✨
Intercooler Js
Making AJAX as easy as anchor tags
Amplify
AmplifyJS is a set of components for data management and application communication.
Bacon.js
FRP (functional reactive programming) library for Javascript
Visibility.js
Visibility.js allows you to determine whether your web page is visible to a user, is hidden in background tab or is prerendering. It allows you to use the page visibility state in JavaScript logic and improve browser performance by disabling unnecessary timers and AJAX requests, or improve user interface experience (for example, by stopping video playback or slideshow when user switches to another browser tab).
Grapnel.js
A simple, lightweight library making it easy to create routes or run events based on a specific URL hashtag.
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Csso
CSS-optimizer
Backbone Associations
Create object hierarchies with Backbone models; Respond to hierarchy changes using regular Backbone events.
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.
Vis
Dynamic, browser-based visualization library
Rx Js
The Reactive Extensions for JavaScript