phpMAS (Multisite Authorization System) is a cross-domain PHP user-management script. Using single DB(mysql) to manage users from other sites(or domains) like YAHOO or GOOGLE, it can be integrated into many public scripts (phpBB,myBB,wordpress...)
AutoIndex is a PHPscript that makes a table that lists the files in a directory, and lets users access the files and subdirectories.
It includes searching, icons for each file type, an admin panel, uploads, access logging, file descriptions, and more.