match.color.io - Automatically match colors of any image or movie with ML
Color Palette Generator - Enter the URL of an image and find its color palette
Material Palette - Generate and export your Material Design color palette
Colores - Find color palette ideas via image search
Klart.io Colors - A data-driven collection of beautiful color palettes 🌈
Alembic ⚗️ - A Sketch plugin to extract a color palette from your images