nomacs - nomacs is a free, open source image viewer, which supports mu
Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
Mirage - Mirage is a fast and simple GTK+ image viewer.
LightGallery - A modern, electron and nodejs based image viewer for Mac, Windows and Linux.
GPicView - GPicView is a simple and fast image viewer with low memory usage.
jQuery Lightbox - jQuery Lightbox plugins are utilized to showcase images and other web stuff using modal dialogs.