Color Hunt - Curated collection of beautiful colors, updated daily
Linia - You will never look at colors the same way...
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.
Colicious - A delicious color generator
match.color.io - Automatically match colors of any image or movie with ML