kcolorchooser 4:16.12.3-0ubuntu1 (amd64 binary) in ubuntu zesty

 KColorChooser is a color palette tool, used to mix colors and create custom
 color palettes. Using the dropper, it can obtain the color of any pixel on
 the screen.
 .
 A number of common color palettes are included, such as the standard Web colors
 and the Oxygen color scheme.
 .
 This package is part of the KDE graphics module.