Color Scheme Designer

Arguably the best online tool available to create color schemes
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Color combos

Allows web developers to see how different color combinations work together on the screen
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Color Explorer

With the colorful toolbox at ColorExplorer you can easily create, manage, and explore color palettes for use in web designs, desktop publishing, or any other graphic design process.
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Kuler

Adobe’s online color toolset
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Color Jack

Featuring several apps such as Color Sphere which allows you to choose the right color scheme supporting 18 formulas and 9 color blindness simulations. There’s also Color Galaxy, an online color visualizer with colors from 27 libraries including everyone’s favorite forever and ever, Crayola.
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Color Hunter

Allows you to create and find color palettes from photographs.
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