RCWebColorPicker

RC Web Color Picker expands the color range of Mac OS X with Web colors. So you can now easily choose a color using the system color picker and easily read the hex value of the color.
The program also offers the option to display only Web-safe colors. To do that RCWebColorRicker will suit your selected color to a web-safe color. Doesn't correspond the adjusted color, you can make adjustments to your wishes with the help of sliders.