1)   SI ColorPicker 1.0
Pick pixel colors as HTML, HEX or RGB values. Drag the eyedropper tool onto a picture or anything else on your desktop, and SI ColorPicker will display the exact value of that pixel in a number of formats from HTML to RGB.

 2)   ActSoft Color Picker ActiveX 1.2
It is an ActiveX control that looks like Office color dialog, with much more easy way of selecting colors. It has a drop down palette, Office style, and color dialog box style which ease user work to select any color.

 3)   GetColor! - Color Picker 1.01
GetColor! allows you to retrieve the color of any pixel on your desktop easily: just move the eyedropper tool into any place of your desktop and GetColor! will show you the color value!