Klart.io Colors - A data-driven collection of beautiful color palettes 🌈
Adobe Color CC - Generates color themes that can inspire any project.
Color Hunt - Curated collection of beautiful colors, updated daily
iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.
Colicious - A delicious color generator
Colllor - With Colllor it is much easier to generate a consistent color palette with just a few clicks.