Since this is for photos, you might try Gallery, which is a php
application, so it should run under any OS that supports PHP and a web
server. It can be set up to have an album per user, supports logins, etc.
Nothing other than a web browser needs to run on the client machines, so
it's pretty platform independent. A couple Galleries I host are at

http://www.kcpralumni.org/gallery

http://www.cccds.org:8080/gallery

For a pure file repository, it seems like just an FTP server with clients
running something like FileZilla would work.

Harold


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