Flickr - image and video hosting website
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
ImageBam - Free Image Hosting and photo sharing.
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.
UploadHouse - Thumbnail and resize your photos and images