D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG and CSS. D3’s emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework, combining powerful visualization components and a data-driven approach to DOM manipulation.

Jasmine is a behavior-driven development framework for testing JavaScript code.

Andy Clarke slide deck on grids

Less Framework is a CSS grid system for designing adaptive web­sites. It contains 4 layouts and 3 sets of typography presets, all based on a single grid.

The 1140 grid fits perfectly into a 1280 monitor. On smaller monitors it becomes fluid and adapts to the width of the browser.

A simple CSS framework for designers and developers, based on 35 equal-width columns. It aims to cut down on development time and help you create beautiful-structured websites.

Rickshaw is a JavaScript toolkit for creating interactive time series graphs.