FTP like web app

[Andrea Venturoli]

Hello.
Sorry if this is a bit OT, but I'm looking for an app that should:
_ replace an ftp server;
_ have a web interface;
_ run on FreeBSD;
_ let one of my users upload some file and send a link to someone else;
_ let that someone else download that file without seeing others' stuff;
_ possibily notify the uploader when someone else downloads that file.

Any hint?

  bye & Thanks
	av.