Use.js
An AMD/RequireJS plugin for consuming incompatible JavaScript files.
Stampit
Create objects from reusable, composable behaviors.
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.
PreloadJS
PreloadJS makes preloading assets & getting aggregate progress events easier in JavaScript. It uses XHR2 when available, and falls back to tag-based loading when not.
Twitterlib
Twitter JavaScript API library
Pilot
Pilot — multifunction JavaScript router.
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Platform.js
A platform detection library that works on nearly all JavaScript platforms.
Bootstrap Ajax
A library for adding declarative ajax functionality to your website
Backbone Nested
A plugin to make Backbone.js keep track of nested attributes.
Jquerypp
jQuery's missing utils and special events
Min Pub Sub
198 byte publish/subscribe messaging micro-framework
Sentry
Sentry is a realtime error logging and aggregation platform
Mousetrap
Simple library for handling keyboard shortcuts in Javascript
ifvisible.js
Checks if the current page is visible or not
Then.js
The fastest, smallest, fully compatible, full-featured asynchronous module!