Due to legal reasons, that kind of information can not be divulged on the forums. As with all software, you might be able to find an illegal copy.
However, SOF is "lightly supported", and can be bought at amazon for $15:
http://www.amazon.com/EverQuest-Secr.../dp/B000WCUNNK
As far as I know, the only classic zone that had trouble was HighPass. It'd be nice if SoF would be supported more since Titanium is no longer sold (to my knowledge, atleast), but I understand the issues with supporting two different clients.