http://www.plogger.org/

http://piwigo.org/

Piwigo is photo gallery software for the web, built by an active community of users and developers.

https://phpgrabcomics.org/

GNU phpGrabComics is a software program to grab and save comic strips from the web. Its aim is to help users to read and archive their favorite comic strips.

http://phpautogallery.sourceforge.net/

https://sourceforge.net/projects/photoframe/

https://sourceforge.net/projects/otfgallery/

Yet another photo gallery. It's a minimalistic, yet usable gallery, which requires minimal setup. Requires PHP4, GD, and JPEG-support

http://galleryproject.org/

http://www.funkgallery.com/

FunkGallery, the FREE full function, highly customizable, open-source photo gallery software system. It uses the powerful PHP language and MySQL database.

https://sourceforge.net/projects/easyphpalbum/

SINGLE SCRIPT photo, music, and video gallery. With the web-based configuration, SEO, easy navigation & clean layout. Easy to integrate into existing sites

http://www.dalbum.org/index.php

DAlbum is a free PHP photo album. It is small, easy to install and highly customizable at the same time. Features include slide shows, image comments, support for video and PDF files and much more.