Pixie by Nattyware is a color picker designed for webmasters. This Windows based freeware will give you the hex, RGB, CMYK, HSV, and HTML codes for any color you select on your page. If you have an interest in modifying this program for your own uses, it is possible to purchase the source code but the working, compiled program is free.

http://http://www.nattyware.com/pixie.php