ifvisible.js
Checks if the current page is visible or not
Rx Js
The Reactive Extensions for JavaScript
Pilot
Pilot — multifunction JavaScript router.
Tangle
a JavaScript library for reactive documents
When
A solid, fast Promises/A+ and when() implementation, plus other async goodies.
Machina.js
js ex machina - finite state machines in 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).
Invisible
Invisible.js: Reusable models for the client and the server
Vis
Dynamic, browser-based visualization library
jTypes
jTypes is the most comprehensive and robust JavaScript library for overcoming differential inheritance with prototype-based objects. Its lightweight yet powerful design provides web programmers on any platform or browser the ability to emulate classical inheritance where objects are defined by classes.
Backbone Deep Model
Improved support for models with nested attributes.
Backbone Associations
Create object hierarchies with Backbone models; Respond to hierarchy changes using regular Backbone events.
Gas
Google Analytics on Steroids. A Google Analytics implementation with more power features.
Curl
A small, fast module and resource loader with dependency management. (AMD, CommonJS Modules/1.1, CSS, HTML, etc.)
Backbone React Component
A bit of nifty glue that automatically plugs your Backbone models and collections into your React components, on the browser and server
Tweet
put twitter on your website with tweet, an unobtrusive javascript plugin for jquery
jStorage
jStorage is a simple key/value database to store data on browser side. As a bonus it is also a local pubsub platform to sync data between tabs/windows