Queue
Yet another asynchronous helper library for JavaScript. 387 bytes minified and gzipped!
Px Loader
PxLoader is a simple JavasScript library for creating preloaders and resource downloaders for HTML5 apps.
Buster
A powerful suite of automated test tools for JavaScript.
Kefir
A Reactive Programming library for JavaScript
Weld
Template antimatter for Node.js (Browsers too!)
Simplate
A simple, but powerful, templating engine for JavaScript.
Scale App
scaleApp is a JavaScript framework for scalable One-Page-Applications
Componentjs
ComponentJS -- Powerful run-time Component System for structuring HTML5-based Rich Clients
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
Mobx
Simple, scalable state management.
Prime
an OOP javascript library for node.js and the browsers
Js Cache
jsCache is a javascript library that enables caching of javascripts, css-stylesheets and images using my localStorage polyfill. This is especially useful when serving your website for mobile phones, which have limited HTTP caching available, but also speeds up your site in an ordinary web browser as it saves HTTP requests and loads all files asynchronously.
Highway
A fast, lightweight and simple Javascript routing library with no dependencies.
ifvisible.js
Checks if the current page is visible or not
Theory
Abstraction layer for cross platform JavaScript.
T.js
A tiny javascript templating framework in ~400 bytes gzipped
Muuri
Responsive, sortable, filterable and draggable grid layouts