Mobbin - Latest mobile design patterns & elements library
match.color.io - Automatically match colors of any image or movie with ML
pttrns - iPhone and iPad user interface patterns
Color Palette Generator - Enter the URL of an image and find its color palette
Page Flows - User flow design inspiration for mobile & desktop
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.