Gal(lery)(1) is a db-less picture gallery system, all it needs is a directory for thumbs and path to raw pictures. If new pic is added, gal is updated automatically. Also supports an external directory to store comments about images, to be viewed with the image. Written as a python cgi script.
Gal(lery)2 is an improved version based on gal1, this time in PHP for performance and portability(not every webhost has python). Just like the previous, but with vastly improved ui and codebase. Take a look at my gallery. Images are those of pics.
Also features a PHP-based syncing script that can be invoked with browser to pull images from another computer to local sub/folders. I use it to pull pic-updates from routa to my main webhost.