PhotoFS is a Web-based photo album or image gallery, based on the files-as-directories and attributes-as-files concepts at the core of the ReiserFS 4 filesystem. It does not require ReiserFS 4, but is much more efficient on that system than on others. It does many of the same things as other Web galleries, at least as far as the basics go. What makes it different is its use of the filesystem instead of a database. It allows you to use regular unix tools to access your photo collection. It can handle very large collections, and also encourages multiple categories per file, deep category hierarchies, and batch processing.