Culrs - A simple, smart approach to choose color palettes
Color Palette Generator - Enter the URL of an image and find its color palette
Material @ Colorion - Material design compatible curated color palettes.
Color Koala - The Koala-ty color palette generator, creating gorgeous colors for all of your side projects.
Happy Hues - Curated color palettes in action
Colorion - Curated color palettes with search and tags support