Google Images - Google Images is a search service owned by Google that allows users to search the World Wide Web for image content.
Flickr - image and video hosting website
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
SauceNAO - SauceNAO is a reverse image search engine.
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.