These are all working as of today. And all are public.
Most need an email auth sent to you.
I think Mongo is one of the few that don't?
I could have listed a thousand more.. but didn't. I didn't list any porn or such or many other specialized sites... But they are out there. (Which is partly why I included the FileSoup and Emule-Help links. I tried to give you a nice sampling, though, of various different types of sites (that work!) Anyway good luck finding what you need!
For those who care about such things, I use Azureus and BitComet(0.57), the latter being a C++ program. Both for Bit Torrent protocol if you don't know.
(newest version or
eMule LSD client/mod).