Boiler
Boiler is a utility library that makes every day tasks in JavaScript easier by providing over 115 methods that work on arrays, collections, functions, numbers, objects, and strings.
Humane.js
A simple, modern, browser notification system
Intercooler Js
Making AJAX as easy as anchor tags
Tweet
put twitter on your website with tweet, an unobtrusive javascript plugin for jquery
Steal
Gets JavaScript
Meld
AOP for JS with before, around, on, afterReturning, afterThrowing, after advice, and pointcuts
Is.js
Micro check library
Async
Async utilities for node and the browser
Ramda
:ram: Practical functional Javascript
Mobservable
Observable data. Reactive functions. Simple code.
P
Peer-to-peer networking with browsers
Lunr.js
A bit like Solr, but much smaller and not as bright
Fetchival
window.fetch wrapper for writing simple and expressive requests
Queen
A platform for running scripts on many browsers
Mousetrap
Simple library for handling keyboard shortcuts in Javascript
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
Curl
A small, fast module and resource loader with dependency management. (AMD, CommonJS Modules/1.1, CSS, HTML, etc.)