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.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
LightGallery - A modern, electron and nodejs based image viewer for Mac, Windows and Linux.
qimgv - Simple image viewer written in qt. Supports webm playback.
jQuery Lightbox - jQuery Lightbox plugins are utilized to showcase images and other web stuff using modal dialogs.