Palette Ninja - Create harmonious color schemes
Colormind.io - A color palette generator powered by deep learning.
Color Palette Generator - Enter the URL of an image and find its color palette
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
Image Color Summarizer - The web service provides statistics describing color characteristics of an image identified by URL.