Flickr - image and video hosting website
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Duplicate Cleaner - Duplicate Cleaner: the fastest and most popular tool for finding duplicate files. Over 1 million downloads: Get your copy now! Free and Pro versions available.
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.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.