Knockout
Knockout makes it easier to create rich, responsive UIs with 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.
Hermes.js
Message and Error logger implementation
Theory
Abstraction layer for cross platform JavaScript.
T.js
A tiny javascript templating framework in ~400 bytes gzipped
Scale App
scaleApp is a JavaScript framework for scalable One-Page-Applications
Pilpil
Pilpil - Progressive Image Loading
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.
Jquerypp
jQuery's missing utils and special events
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
Steal
Gets JavaScript
Fluxxor
Flux architecture tools for React
Google Closure Library
git-svn mirror of Google's Closure Library.
Highway
A fast, lightweight and simple Javascript routing library with no dependencies.
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.
Carrot
🥕 Multi-threaded Self-Assembling Neural Networks in Node.js & Browser
Connective
agent-based reactive programming library for typescript