Adobe Color CC - Generates color themes that can inspire any project.
ColorZilla - ColorZilla is an extension for Mozilla Firefox and the Mozilla Suite.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!
Colors & Fonts - Css gradients, color palettes & font pairing 1 click 1 place
Paletton - Color Scheme Designer
iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.