Tired of seeing those tons of CSS declarations when using Firebug or Webkit inspector? Then try the Reset De-Compactor.
This works by expanding your grouped declarations into single rules. This is only meant for development work.
Chosen is available as a plugin for jQuery, Prototype and there’s a fork for MooTools.
BgPatterns is a background pattern creator with tools to set color, base pattern, rotation of motif and more.
A very useful tool when you have to calculate complex box dimensions in CSS
This tool takes into account borders, paddings, margins and of course, content width.
Dropr is a “platform that aims to bring together artists of all media & backgrounds”.