Blueprint is a CSS framework, which aims to cut down on your CSS development time. It gives you a solid CSS foundation to build your project on top of, with an easy-to-use grid, sensible typography, and even a stylesheet for printing.

Simple Content Management and Syndication

XRAY is a bookmarklet for Safari, Firefox, Camino or Mozilla. Use it to see the box model for any element.

tingelets are a set of bookmarklets that you can place in your browsers bookmark bar. When clicked, they highlight a certain tag or set of tags in a specific color or background tile.