Image Colour Transfer - A free-to-use browser-based application that allows an image to be recoloured to match the colours of another image using novel methods.
Color Palette Generator - Enter the URL of an image and find its color palette
Colores - Find color palette ideas via image search
Mobile Palette Generator - Generate color palettes with a click of the mouse
Alembic ⚗️ - A Sketch plugin to extract a color palette from your images
Site Palette - Get the essential colours from any website