freePHPgallery is an easy-to-use free PHP picture gallery. It automatically creates picture indexes with thumbnails, offers a commenting function and the selection of multiple languages.
It does NOT require a database or any other additional software.
For a demonstration have a look at: gallery.mbod.net
Feel free to try everything out!
You can download the software here: sourceforge.net/projects/freephpgallery
Please use the feedback form to tell me what you think about it. If you already use this software, you may also give me your email address, so that I might inform you, when there are any security updates.