iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.
Palette Ninja - Create harmonious color schemes
Adobe Color CC - Generates color themes that can inspire any project.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!
Colllor - With Colllor it is much easier to generate a consistent color palette with just a few clicks.
ColorExplorer - Simply put, ColorExplorer is an online toolbox for working with color palettes.