Handy and nicely executed.
color
Color wheel | Color schemes – Adobe Color CC
Colormind
“a deep learning AI that knows color theory. It can generate color palettes from scratch, or it can take your input and intelligently fill in the blanks “
International Color Symbolisms Chart
Color Lisa
“a curated list of color palettes based on masterpieces of the worlds greatest artists.”
Humanae
a chromatic range of the different human skin colors