Color pickers

I just wanted to write down the name of a new color picker
that looks quite useful and has some extra features like adding the matching colors :
anry color picker
Another one is on the page pixeur.
Both are designed for windows.
In Linux thre are two standard ones,
for Gnome the tool is named gcolor2,
and for KDE kcoloredit- a color palette editor and also a color
picker.