A well-styled "Index of" page can be a beautiful, functional file browser for your open-source project.
Many admins rely on "secret URLs" like yoursite.com/admin/secretarea/ . Directory indexing immediately exposes that "secret" area to anyone who guesses the parent folder.
During development, an Index of page is invaluable. You can quickly verify that files have uploaded correctly, check timestamps, and ensure folder permissions are working without writing a single line of HTML.
The [ICO] column often shows icons for different file types. [PARENTDIR] allows you to move up one level in the directory tree. [DIR] indicates a subfolder containing its own potential listings.
Index of Paper and Pulp Production for United States ( ... - FRED