gcolor2 is a basic colourpicker utility that allows you to select any colour on your screen, and, well, grab it's colour. It also allows you to save the colour you create to a file, which shows up as a list in the application.
gcolor3 AlternativesColor Picker Tools and other similar apps like gcolor3
gcolor3 is described as 'Simple color-picker with a beautiful interface for Ubuntu Linux and other distributions' and is a Color Picker tool in the photos & graphics category. There are 1 alternatives to gcolor3 for Linux and Xfce. The best gcolor3 alternative is gcolor2, which is both free and Open Source.