LinPHA is an easy-to-use, multilingual, flexible photo/image archive/album/gallery written in PHP. It uses an SQL database (MySQL/PostgreSQL/SQLite) to store information about your pictures. It comes with an HTML-based installer, so you don't need experience in setting up SQL databases. Thumbnails are created as needed and stored in the SQL DB. It features complete user management, top ten statistics, hidden albums, different themes, slideshow, filemanager, uploader, watermarks, benchmark, printing, and more.
Active Image Viewer is an image viewer that provides a very efficient way to display multiple images within a small area. Thumbnails are automatically generated and displayed (removing the need to create smaller versions of images). When a visitor clicks a thumbnail, the full size image is displayed within the current page. Each full size image may have a link attached to it which can be set to either open in the current browser window or a new window.