ColorBlender
You can slide the RGB buttons to create a core color which then automatically creates a coordinating palette.

DeGraeve
Input the URL of an image and the site will generate a lovely palette to match.

Kuler
Kuler from Adobe Labs helps you create endless colors and you always come out looking like a pro.

EasyRGB
Match your RGB values to real color paint lines (including Sherwin Williams), inks, fandecks, etc.

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