ColorCache 

ColorCache is a powerful color picker, color scheme generator and palette management system. Select colors from your screen or use the built-in tools to create color schemes. Preview results in your own web pages or export in a variety of formats.
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Absolute Color Picker 

Absolute Color Picker is a freeware enhanced color selection dialog with RGB and HSB color models. Unique color selection dialog models provide versatile color schemes for selecting necessary color hue, brightness and transparency values.
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