Color Palette Generator - Enter the URL of an image and find its color palette
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
Material Palette - Generate and export your Material Design color palette
Unsplash Wallpapers for Mac (Official) - Curated, HD desktop background photos from Unsplash.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!
Unsplash - Unsplash is a website with high-quality free HD images. It has a catalog of more than three hundred thousand striking images that are neatly organized with tags. Read more about Unsplash.