Viso - Beautiful minimal image viewer for MacOS
Flickr - image and video hosting website
LightGallery - A modern, electron and nodejs based image viewer for Mac, Windows and Linux.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
digiKam - Professional Photo Management with the Power of Open Source
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.