iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.
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!
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
Happy Hues - Curated color palettes in action
Color hexa - Color hex encyclopedia providing information about any color.