SurgeFTP

From NetWin:

An FTP server which gives you top performance, reliability, reporting tools and most importantly, ease of management. With a few clicks you can generate a report to show who's using your server, and more importantly who is misusing it, wasting your bandwidth and resources. Full SSL/TLS security in SurgeFTP for Windows, Linux, FreeBSD, Solaris and Mac OSX. You can list downloads by ip address/user or file name, sorted by volume. And then click through for more details. Reports can cover the last day, week or month.