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

More features are: 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.

Since version 1.7.1, 4images contains an internal caching system.   This means, if you change something in your gallery such as
- add/edit images
- add/edit categories
- add edit usergroups and permissions
- add/edit templates
- change default language
you must clean up the cache to ensure that your visitors don't see old data from the cache.