Gallery

Is an open source web based photo album organizer.
Gallery gives you an intuitive way to blend photo management seamlessly into your own website whether you're running a small personal site or a large community site.

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.
Endless Features! Far to many to list them here.
You can check their DEMO From Here

Piwigo

Piwigo is a photo gallery software for the web, built by an active community of users and developers.
Extensions make Piwigo easily customizable. Designed for organizations, teams and individuals.

Zenphoto

Zenphoto is a image hosting, gallery focused websites. Zenphoto is easy to use and having all the features there when you need them.
Zenphoto features support for various media formats and integrated blog and custom pages.
Zenphoto is the ideal CMS for personal websites of illustrators, artists, designers, photographers, film makers and musicians.

Plogger

A web application not bloated with superfluous features or complicated configuration settings.
Plogger is a simple yet powerful tool — everything you need to share your images with the world.
A fully featured photo sharing package with an attractive and easy to use administrative interface

Pixelpost

A small photo blog application that is easy to set up and use.
It is perfect for anyone wishing to regularly post their photos on the web like a blog.
Unlike other big blog engines out there, Pixelpost simply does photo blogs, and it does them well.
If you want something simple, then this is it!

4images

a powerful web-based image gallery management system.
Features include comment system, user registration and management, password protected administration area with browser-based upload and HTML templates for page layout and design.
4images is multilingual, external language file can be used for translation in other languages.
More features: RSS feeds, search engine, automatic thumbnail generation, extensive user administration, upload function for users, showing IPTC and EXIF data of images,
rating of images, spam protection, protection against hotlinking, newsletter function, e-cards, integrated database backup function, etc.

phpAlbum

phpAlbum is an image hosting script which allows you to create your Photo Album Gallery in a few seconds.
No database is needed. After a few clicks you are ready to upload your photos, create new directories galleries, and have fun with your photo album.

TinyWebGallery

TinyWebGallery is a free photo gallery for both personal and professional use.
Unlike the large photo sharing sites, such as Flickr, Shutterfly, Picasaweb...
TinyWebGallery is very easy to install, extremely user friendly, does not need a database (uses xml files)
but still has all the features you should expect and much more!

Lychee

Lychee is the perfect place to store all your photos. No storage limit, no compression, no loss in data.
Even supports and display your EXIF and IPTC Metadata.
Lychee is photo-management tool which helps you to upload, manage and even share photos very fast and quick.