Color Palette Generator - Enter the URL of an image and find its color palette
match.color.io - Automatically match colors of any image or movie with ML
Material Palette - Generate and export your Material Design color palette
Klart.io Colors - A data-driven collection of beautiful color palettes 🌈
Colores - Find color palette ideas via image search
Color Palette Manager - This nifty app helps you create, manage and share palettes.