Open Source Photo Gallery

OK, here's another Free resource which I've used many times on client sites.

Coppermine Photo Gallery

"Coppermine is a multi-purpose fully-featured and integrated web picture gallery script written in PHP using GD or ImageMagick lib with a MySQL backend."

Rather good it is too. It's Free, it's easy to install and it covers just about any requirement you might have for an image gallery. You can even skin the gallery with changes to the CSS and templates.

Marvelous!