Multi-Dimensional charting built to work natively with crossfilter rendered with d3.js
Delightful, performance-focused pure css loading animations.
Reveal CSS animation as you scroll down a page
noty - jquery notification plugin
A positioning engine to make overlays, tooltips and dropdowns better #hubspot-open-source
BDD / TDD assertion framework for node.js and the browser that can be paired with any testing framework.
Navigable waveform built on Web Audio and Canvas
Node.js Desktop Automation.
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
Give your pages some headroom. Hide your header until you need it
Peer-to-peer data in the browser
a 2D rigid body physics engine for the web