Colormind.io - A color palette generator powered by deep learning.
Colllor - With Colllor it is much easier to generate a consistent color palette with just a few clicks.
Paleta - Extract the dominant colors from any image.
Color Palette Generator - Enter the URL of an image and find its color palette
Image Color Summarizer - The web service provides statistics describing color characteristics of an image identified by URL.
Adobe Color CC - Generates color themes that can inspire any project.