Tweet
put twitter on your website with tweet, an unobtrusive javascript plugin for jquery
Enyo
A JavaScript application framework emphasizing modularity and encapsulation
ifvisible.js
Checks if the current page is visible or not
Knockout Projections
Knockout.js observable arrays get smarter
Aload
Loads images, scripts, styles, iframes, videos and audio asynchronously.
Gas
Google Analytics on Steroids. A Google Analytics implementation with more power features.
Mobservable
Observable data. Reactive functions. Simple code.
Loglevel
Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Terrificjs
Terrific JavaScript Framework
Riotjs
The 1kb client side MV* library
Paperclip.js
reactive DOM template engine built for speed, and extensibility
Lucid Js
LucidJS is a chainable event emitter library. It offers several unique features such as set events, emitter piping, DOM node encapsulation, sub events, along with the usual event triggering and binding. LucidJS emitters also feature meta events that allow listening for event binding and event triggering. LucidJS works in both the browser and node.js.
Robotjs
Node.js Desktop Automation.
Derby
MVC framework making it easy to write realtime, collaborative applications that run in both Node.js and browsers
Sproutcore
JavaScript Application Framework - JS library only
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.
Hamsters.js
100% Vanilla Javascript Multithreading & Parallel Execution Library