WhatColor identifies a color of the pixel on the screen. There are some similar tools to display RGB values to assist making HTML used in authoring WWW pages. WhatColor tells you not only RGB values, but also the name of the color of the point.
Software for colorblind people. Dalton is software allowing people with different kinds of color blindness to see more colors. Dalton provides solutions to some of the everyday problems experienced by colour blind people.