Flickr - image and video hosting website
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.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Piwigo.org - Manage your photo collection with Piwigo. Piwigo is open source photo gallery software for the web. Designed for organisations, teams and individuals.
novaGallery.org - Beautiful php image gallery - easy to use, with modern responsive design, private mode, themes, languages
Photobucket - Photobucket offers image hosting and free photo and video sharing.