Yeah, this is a good one. They keep it updated and all that. It scans and finds a ton of them and it's an ease to switch from one to another, just click a button. The full version for (I think) $50 is what you want since that one finds those Elite proxies which I'm sure you're after since the basic anonymous ones typically send a string with your IP anyway letting a website know you're on a proxie. Cool thing with this app too is that you can add your own proxies manually, even import a full txt file and have the thing test them.
I got all 5 files I wanted last night thanks to this thing. Crazy dude. He uploads pirated stuff on his site, then sets a download limit to 1 a day.