Pegasus
Load data while still loading other scripts and display data faster in jQuery, Backbone, Angular, ... apps
Tweet
put twitter on your website with tweet, an unobtrusive javascript plugin for jquery
Hamsters.js
100% Vanilla Javascript Multithreading & Parallel Execution Library
Contra
Asynchronous flow control with a functional taste to it
JayData
JayData is a unified data access library for JavaScript to CRUD data from different sources like WebSQL/SQLite, IndexedDB, MongoDb, ASP.NET WebAPI, OData, HTML5 localStorage, Facebook or YQL. The library can be integrated with KendoUI, Knockout.js, Handlebars.js or Sencha Touch 2 and can be used on Node.js as well.
Backbone Associations
Create object hierarchies with Backbone models; Respond to hierarchy changes using regular Backbone events.
Backbone Nested
A plugin to make Backbone.js keep track of nested attributes.
Then.js
The fastest, smallest, fully compatible, full-featured asynchronous module!
Stately.js
Stately.js is a JavaScript based finite-state machine (FSM) engine for Node.js and the browser.
Meld
AOP for JS with before, around, on, afterReturning, afterThrowing, after advice, and pointcuts
Mediator.js
An implementation of the mediator pattern for asynchronous events in Javascript
Routie
a tiny javascript hash router
Inject
AMD and CJS dependency management in the browser
Cellx
Ultra-fast implementation of reactivity for javascript
Gas
Google Analytics on Steroids. A Google Analytics implementation with more power features.
Davis.js
RESTful degradable JavaScript routing using pushState
Node Decorators
node-decorators