ColorPix
ColorPix is a useful little color picker that grabs the pixel under your mouse and transforms it into a number of different color formats.
You can use the built-in magnifier to zoom in on your screen, click on a color value to copy it directly to the clipboard, and even keep ColorPix on top of all other apps and out of the way.
HTMLcolor
Easily produce color values for your web documents with this advanced HTML color picker.
HTMLcolor lets you configure your own colors (RGB input) and paste the results (HTML code) in your web document. Previews fore, back and links-colors. Option to load image files. HTMLcolor even creates web-pages for you.
Color Pop
ColorPop is the professional pop-up color picker control for webpages. Include Colorpop on your website and allow your users to select colors from an easy to use palette. Prices are per website.
Instant Eyedropper
Instant Eyedropper is a free software tool for webmasters that will identify and automatically paste to the clipboard the HTML color code of any pixel on the screen with just a single mouse click.
Color Cop
Color Cop is a multi-purpose color picker for web designers and programmers. It features an eyedropper, magnifier, variable magnification levels, 3 by 3 and 5 by 5 average sampling, snap to websafe, color history, and a 42 color complementary palette. Color Cop will convert RGB decimal values to Hexadecimal color codes. It has color code support for HTML Hex, Delphi Hex, PowerBuilder, Visual Basic Hex, and Visual C++ Hex. Color Cop is a multi-purpose color picker for windows.