Scene Graph.js
HTML5 Canvas and Animation Framework
Routie
a tiny javascript hash router
Poly
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Onfire.js
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
Jscritic
Quickly check how well 3rd party script behaves.
Intense Images
A simple library to view large images up close using simple mouse interaction, and the full screen.
Humanize
A simple utility library for making the web more humane. #hubspot-open-source
Hasher
Browser history manager for rich media websites
Domready
let's you know when the dom is ready
Canjs
Can do JS, better, faster, easier.
Black
World's fastest HTML5 2D game engine 🛸
Apitizer
API mocking for client JavaScript applications
Animo.js
A powerful little tool for managing CSS animations
Theory
Abstraction layer for cross platform JavaScript.
Kimbo.js
An ECMAScript 5 only-compatible JavaScript library.
Cram
Simple AMD and CommonJS module bundler.
Viewport
Gets the dimensions of the Viewport and beyond.