Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
Ralpha Image Resizer - High-speed image batch conversion tool
jQuery Lightbox - jQuery Lightbox plugins are utilized to showcase images and other web stuff using modal dialogs.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
prettyPhoto - prettyPhoto is a jQuery Lightbox clone.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.