Terrificjs
Terrific JavaScript Framework
Batman
Fighting Crime and Kicking Apps
Twitterlib
Twitter JavaScript API library
Knockout Projections
Knockout.js observable arrays get smarter
Modules Webmake
Bundle CommonJS/Node.js modules for web browser
Tempo
Tempo is an easy, intuitive JavaScript rendering engine that enables you to craft data templates in pure HTML.
Do T
The fastest + concise javascript template engine for nodejs and browsers. Partials, custom delimiters and more.
Lunr.js
A bit like Solr, but much smaller and not as bright
Componentjs
ComponentJS -- Powerful run-time Component System for structuring HTML5-based Rich Clients
jsMessage
Custom messages, alerts, confirmations
Lodash
An alternative to Underscore.js, delivering consistency, customization, performance, and extra features.
Aura
A scalable, event-driven JavaScript architecture for developing widget-based applications. Works with Backbone.js and other frameworks.
Bootstrap Ajax
A library for adding declarative ajax functionality to your website
Google Closure Library
git-svn mirror of Google's Closure Library.
Script.js
Asyncronous JavaScript loader and dependency manager
Px Loader
PxLoader is a simple JavasScript library for creating preloaders and resource downloaders for HTML5 apps.