Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
ACDSee - ACDSee is an image viewer that uses very little system resources, and it has a small, sleek size that won't take up much space on your system.
jQuery Lightbox - jQuery Lightbox plugins are utilized to showcase images and other web stuff using modal dialogs.
digiKam - Professional Photo Management with the Power of Open Source
prettyPhoto - prettyPhoto is a jQuery Lightbox clone.
Flickr - image and video hosting website