FlashGallery is a free, simple photo gallery built in Macromedia Flash 2004, that uses XML files to store the information about which images to display. The gallery is easy to configure and update since you need to change only the XML file. It supports Latin, Cyrilic, Chinese and any other language you can think of. Also, it is really lightweight with only 11KB. It may be used in any kinds of personal and or commercial projects.

Requirements:Flash 2004+
Demo: http://www.flashgallery.org/demo.html
License: License Free