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
Random Color Palettes - Generate a random color palette by tapping your space bar
Colores - Find color palette ideas via image search
Material Palette - Generate and export your Material Design color palette
Alembic ⚗️ - A Sketch plugin to extract a color palette from your images