20) Kuler

Kuler is a Flash-based theme creator from Adobe that you can use to test website color combinations.

You can use the color wheel, harmony rules, and color sliders to match your colors precisely. You can also manually input numeric values for different color models like CYMK, RGB, LAB, HSV or use hexadecimal digits. You can also create themes from images, share your creations with other users and receive feedback. Registration is needed to save your customized theme and access extra features. An Adobe AIR-based client is also available.

Price: Free.

19) ColorCombos

ColorCombos is a web service that you can use to select and test website color combinations.

The core function is the Combo Tester that allows you to see how different color combinations match on the screen. The Combo Library is made up of different color swatches (along with their color hex values) that help you look for combination ideas. Last, using the interactive color grabbing tool you can submit a URL and extract a sample of the colors used on any website.

Price: Free.

18) Flickr Color Selectr

Flickr Color Selectr is a free service that displays a gallery of images with a specific color that are inside the CC-licensed image archive on Flickr.

You only need to choose a color from the interactive color picker, and Flickr Color Selectr automatically updates the gallery by showing you all the images that use that very color. A color can also be inserted using hexadecimal digits or a dedicated slider.

Price: Free.

17) ColorPix

ColorPix is a light Windows-only software that lets you grab the color values and screen coordinates of any pixel on your screen.

ColorPix automatically translates any screen color into RGB, HEX, HSB and CMYK color values, and comes with a zoom-able magnifier built in.

Price: Free.

16) Instant Eyedropper

Instant Eyedropper is a downloadable software that works on Windows machines only, and that enables you to grab the HTML code for any color region of your screen.

After the installation you will see a new icon on your system tray: just click on it, hold the left key and release it when you are pointing to the color you want to grab. When you release, a little window will display the code, that will be automatically copied to your clipboard.

Price: Free.