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That's one of those sites that allows people to access sites banned by their company firewall, indirectly. Companies find out about 'em and then ban them, but more keep popping up, some valid, but others are merely fronts for spam, identity theft, trojans, etc. Or --- do you know that already? Anyway, I saw PHProxy referenced on that page and Googled it and it's likely this script found at SourceForge.net. Beyond that, not sure.

-jim
 
It's PHP Proxy and CGI Proxy
PHP proxy has not been updated in awhile and i think has been abandoned by the developer, CGI proxy is still developed. I would check out Glype it has a lot of fined tuned options that PHP Proxy and CGI don't have. And it works on most servers native since it's PHP, but you must have CURL on for it to works as with PHP Proxy...
 
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