Color Palette Generator - Enter the URL of an image and find its color palette
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.
Material Palette - Generate and export your Material Design color palette
Colores - Find color palette ideas via image search
Mobile Palette Generator - Generate color palettes with a click of the mouse
Impalette - Scan images for dominant pantone colors