Bacon.js
FRP (functional reactive programming) library for Javascript
Platform.js
A platform detection library that works on nearly all JavaScript platforms.
Vis
Dynamic, browser-based visualization library
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Mediator.js
An implementation of the mediator pattern for asynchronous events in Javascript
Ramda
:ram: Practical functional Javascript
Superagent
Ajax with less suck - (and node.js HTTP client to match)
Fluxible
A pluggable container for isomorphic flux applications
Node Pg Migrate
Node.js database migration management for Postgresql
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
When
A solid, fast Promises/A+ and when() implementation, plus other async goodies.
Node Decorators
node-decorators
Bottlejs
A powerful, extensible dependency injection micro container for JavaScript applications
Radio
Dependency-free Chainable Publish/Subscribe Library for 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
Node Browserify
browser-side require() the node.js way
Visibility.js
Visibility.js allows you to determine whether your web page is visible to a user, is hidden in background tab or is prerendering. It allows you to use the page visibility state in JavaScript logic and improve browser performance by disabling unnecessary timers and AJAX requests, or improve user interface experience (for example, by stopping video playback or slideshow when user switches to another browser tab).