Piwigo.org - Manage your photo collection with Piwigo. Piwigo is open source photo gallery software for the web. Designed for organisations, teams and individuals.
Flickr - image and video hosting website
PhotoPrism.app - PhotoPrism® is an AI-powered Open Source app for browsing, organizing & sharing your photo collection. 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.
Lychee - Lychee is an open-source, free software program for self-hosted photo management. It can be installed on the user's own server or website. The software permits the uploading and management of photos and also makes sharing photos very easy.
Photobucket - Photobucket offers image hosting and free photo and video sharing.