The TripTracker slideshow is a good-looking, lightweight JavaScript image viewer with an animated slideshow feature. The viewer is free to use in personal or commercial web pages, provided that the script is not sold or exchanged for profit. An unbranded version of the slideshow, suitable also for resale, may be purchased for a one-time per-site license fee (either $25 or $500).

AgileGallery is a photo gallery that rips through the XML output from Picasa (a free download from Google), generates the paging and thumbnails for your photos then displays the full sized images along with any captions entered in Picasa. There is an AJAX and a good looking Flash version available.

A very cool slide show javascript making use of javascript libraries - prototype.lite and moo.fx.

A clean AJAX slideshow script.

An AJAX-powered fading image gallery, complete with a hugely detailed tutorial.

Pyxy-gallery is an AJAX image gallery in PHP and JavaScript, which optionally uses LightBox JS. It is designed to be an ultra-light-weight, "drop-in" image gallery.

fileNice is a free, open source, skinnable, php file browser with Flickr functionality, slideshows and other features. It uses AJAX (XMLHttpRequest) to update pages without reloads.

Billed as the "the super-easy photo gallery", "minishowcase is a small and simple php/javascript online photo gallery, powered by AJAX/JSON that lets you put easily your images in an online gallery, without having to configure databases or changing and customising code (though you may do it if you feel so) allowing to have an up-and-running gallery in a few minutes."