Color Hunter - Color Hunter is a place to find and make color palettes created from images.
Adobe Color CC - Generates color themes that can inspire any project.
Palette Ninja - Create harmonious color schemes
iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.
Color Palette Generator - Enter the URL of an image and find its color palette
Whats Its Color - An image coloring solution feedback utility.