Flickr - image and video hosting website
Splashify - Beautiful desktop wallpapers for Mac and Windows
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
PhotoPrism.app - PhotoPrism® is an AI-Powered Photos App for the Decentralized Web. It makes use of the latest technologies to tag and find pictures automatically without getting in your way. You can run it at home, on a private server, or in the cloud.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android