Adobe Color CC - Generates color themes that can inspire any project.
Color Hunter - Color Hunter is a place to find and make color palettes created from images.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!
Paletton - Color Scheme Designer
Palette Ninja - Create harmonious color schemes
iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.