ColourPickerDialog.NET has a colour wheel and brightness bar to pick a color.
Editor: ColourPickerDialog.NET is a .NET Framework component for software developers to use in their own applications. You can also download it as a FREE desktop tool for picking and converting colours.
ColourPickerDialog.NET has a visual colour wheel and brightness bar to make picking a colour as easy as possible. It can convert Between RGB, HSB and Web (Hex) colours. Unlike the standard colour dialog, ColourPickerDialog.NET supports transparency (alpha) and has a Eye-Dropper so you can pick any colour on your desktop.

Here is a summary of key ColourPickerDialog.NET features:
-Colour Wheel
Users can select a colour using a colour wheel and brightness bar. These visual colour controls made picking a new colour easy.
-Converts RGB, HSB and Web (Hex)
Users can select a colour using RGB, HSB or Web colour codes. As settings are changed, each one is converted to match the selected colour.
-Supports transparency (alpha)
Users can also select an amount of transparency which is returned as part of the the selected colour. Transparency controls can be hidden if they are not required.
-Desktop eye-dropper
Users can select any colour on their desktop by using the built-in desktop eye-dropper. There is a magnifier which makes selecting the correct pixel easier.
-Popular colour swatches
There is a panel which shows a number of popular colours to make selecting fast.
-Simple coding interface
You can include this Colour Picker in your applications in just a few lines of code, its so easy to integrate. you can free download ColourPickerDialog.NET 1.0 now.