Well, i wanted to try Charon, but i couldn't find Linux port.

So i tried with Cedegea 5.1 and it works. It does have some bugs, specialy if you try to lookup few doesens proxys, but still usefull

BTW, anyone know of any good linux proxy scanner?

Most Linux software for the purpose suck quite badly. I would suggest using Wine to emulate Charon until I get time to make something better.