Free PHP Scripts by Gscripts.net

Plogger is the definitive open-source web php photo gallery. Simple to integrate with your site, lightweight, and packed with useful features, Plogger leaves the other php photo galleries in the dust. Automatic thumbnail generation (this saves cpu time because the photo thumbnails are generated only when the photo is uploaded not like some other php photo galleries that generate the photo thumbnail each time they have to show it just because they don't have cached it), cruft free URLs, RSS support, powerful password protected admin area, photo comments, mass downloading and integrated JavaScript slideshow are just a few of the features you'll find in this php photo gallery script. Plogger requires PHP4, MySQL 3.23+ and GD1.0+.

Check the demo.