Color Pickers

Color Cop
Converts RGB decimal values to RGB Hexadecimal Triplets. Includes a built in color picker, preview, and an eyedropper to choose colors anywhere on the screen. Windows 95/98/NT/2000.
http://www.prall.net/tools/colorcop/

Colourificator
Color picker for Windows.
http://septor.screaming.net/

Kokya
Windows software to manipulate, create and save color palettes. Convert any color to its closest Web safe equivalent.
http://www.adsystemsit.com/software/kokya

La Boite a Couleurs
Free Windows graphic tool to pick, modify and convert colors (models: RGB, HLS, HSV, CMY, CMYK). PDF help file is available.
http://pourpre.com/colorbox/indexen.php