Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
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.
FastPictureViewer - A hardware-accelerated image viewer for the modern Windows platform.