Top 10 Free Open Source Image Gallery System

Gallery
Gallery is a web based photo album organizer. Updated often and one of the more popular  gallery scripts, its features include unlimited images and albums, auto image rotation, gallery-wide slideshow, and RSS publishing.

4Images Gallery
4images is a powerful web-based image gallery management system. Features include comment system, user registration and mangagement, password protected administration area with browser-based upload and HTML templates for page layout and design.

Plogger
Plogger is a image gallery platform thats main goal is simplicity and power. Features include XML feeds, custom themes, and automatic thumbnail generation.

Coppermine
Coppermine is a multi-purpose fully-featured and integrated web picture gallery script written in PHP using GD or ImageMagick as image library with a MySQL backend. Features include allowing users to upload images, user comments, and multi picture uploads.

LinPHA
LinPHA is a multilingual gallery system written in PHP. Features include user management, zip-album downloads, top ten statistics, hidden albums, web filemanager with upload capabilities, watermarks, printing, guestbook and a popular community forum for support.

DAlbum
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 many more.

MG2
Minigal is a free php gallery script. It is made to be simple and takes on the minimalistic approach. Made especially for photographers, minigal is design to get your images on the web quickly. Features include template and skin support, multilingual support, and short gallery urls.

Simple Picture Gallery Maker
SPGM is a PHP script that displays picture galleries on the web. Features include subgalleries, slideshows, and new picture highlighting.

Snipe Gallery
Snipe Gallery is a free image management script that allows you to post images on your website organized into albums. Features include dynamic thumbnails, automatic image resizing, and Supports PNG, JPG, and GIF images.

Zenphoto
Zenphoto is an answer to lots of calls for an online gallery solution that just makes sense. After years of bloated software that does everything and your dishes, zenphoto just shows your photos, simply. It’s got all the functionality and “features” you need, and nothing you don’t. Where the old guys put in a bunch of modules and junk, we put a lot of thought. We hope you agree with our philosopy: simpler is better.