Flickr - image and video hosting website
Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
LightGallery - A modern, electron and nodejs based image viewer for Mac, Windows and Linux.
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.
jQuery Lightbox - jQuery Lightbox plugins are utilized to showcase images and other web stuff using modal dialogs.