Visit the GOOP Gallery Blog
GOOP Gallery is a free software file system based photo gallery. No database is required. It's extremely pluggable, drop it into your CakePHP or Drupal application with ease. This demo features the lightbox module. There are two other modules, table style and single image, that you can set in the configuration file. Configuration file also allows you to set size of thumbnails and large images, set number of rows and columns, set number of images per page, set your own watermark and position it and much more.