"La Bo�te � couleurs" is a freeware for Windows written by Benjamin Chartier. It gives you a set of usefull tools to pick, convert and modify colors. Supported color models are:
RGB (red / green / blue) HLS (hue / lightness / saturation) HSV (hue / saturation / value) CMY (cyan / magenta / yellow) CMYK (cyan / magenta / yellow / black) "La Bo�te � couleurs" also has a visual mode made of three kinds of color maps. Moreover, a user-sizable "picker" allows you to copy a color from anywhere on the screen. The software is provided with some color names files (Chroma, RGB, HTML and Pantone colors). A color you've choosen through the interface will be matched to the nearest color in the selected list.
For example, open the Pantone file, then use the picker tool onto the screen: the corresponding Pantone code (the nearest one) is automatically selected.