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.
COLOURlovers - COLOURlovers is a creative community where people from around the world create and share colors, palettes and patterns, discuss the latest trends and explore colorful articles... All in the spirit of love
Colllor - With Colllor it is much easier to generate a consistent color palette with just a few clicks.
Colorwheely - A web tool for making a 12-color color wheel, from one or two starting colors.