iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.
Adobe Color CC - Generates color themes that can inspire any project.
Colorius - An useful color picker application.
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.
Colormind.io - A color palette generator powered by deep learning.