Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
nomacs - nomacs is a free, open source image viewer, which supports mu
jQuery Lightbox - jQuery Lightbox plugins are utilized to showcase images and other web stuff using modal dialogs.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
prettyPhoto - prettyPhoto is a jQuery Lightbox clone.
qimgv - Simple image viewer written in qt. Supports webm playback.