OSS Web-based File Management?

breadiu asks: "I work for a department at a university, and we'd love to offer students some type of web-accessible file storage, but, like most educational institutions, money is tight. There are some great closed source solutions out there like Xythos' Digital Locker Suite, but those cost. I've had trouble finding a really well put together open source solution. I've taken a look at Slide and even Zope, but neither really match up to Xythos' offerings. What have others done to provide centralized file storage/management? Is there anything OSS that offers WebDAV, Apache support, BSD/Linux support and Active Directory-LDAP authentication with support for Windows and Mac clients?"