Expow generates directory indexes. It is written in PHP, can replace the Apache directory autoindexer, can generate indexes "on the fly", and has visualization facilities and file managing abilities. Viewing features include listing in tables, tree view, frames(optional), intensive CSS and icon use, image preload, and overlib support to preview thumbs of pictures. File management features include directory and file creation, file upload, URL upload, and delete file/empty directory.
