Bacon.js
FRP (functional reactive programming) library for Javascript
Tweet
put twitter on your website with tweet, an unobtrusive javascript plugin for jquery
Rx Js
The Reactive Extensions for JavaScript
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.
JS Signals
Custom Event/Messaging system for JavaScript inspired by AS3-Signals
Inject
AMD and CJS dependency management in the browser
Pilot
Pilot — multifunction JavaScript router.
Bootstrap Ajax
A library for adding declarative ajax functionality to your website
Keymaster
A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.
Fast.js
Faster user-land reimplementations for several common builtin native JavaScript functions.
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.
Fast Memoize.js
:rabbit: Fastest possible memoization library
Meld
AOP for JS with before, around, on, afterReturning, afterThrowing, after advice, and pointcuts
Intercooler Js
Making AJAX as easy as anchor tags
Gas
Google Analytics on Steroids. A Google Analytics implementation with more power features.
Speakingurl
Generate of so called "static" or "nice-looking" or "slug" or "SpeakingURL" from a string.
Min Pub Sub
198 byte publish/subscribe messaging micro-framework