Across Tabs
Easy communication between cross-origin browser tabs
Contra
Asynchronous flow control with a functional taste to it
Diagram
JS tool for making node graphs. Inspired by dependency graph
Jailed
Jailed - execute untrusted code with custom permissions
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.
Twitterlib
Twitter JavaScript API library
Onfire.js
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
Gas
Google Analytics on Steroids. A Google Analytics implementation with more power features.
Functional Js
A functional js library that facilitates currying and point-free / tacit programming
ifvisible.js
Checks if the current page is visible or not
Tock
Timer Object/Class. Kickass!
Refluxjs
A simple library for uni-directional dataflow application architecture inspired by ReactJS Flux
Lunr.js
A bit like Solr, but much smaller and not as bright
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Conditioner
Frizz Free, Environment-aware, JavaScript Modules
Davis.js
RESTful degradable JavaScript routing using pushState
Inject
AMD and CJS dependency management in the browser