Hi,
What about glypeproxy ?
Quoting its homepage :
Glype proxy script is a free-to-use,
web-based proxy script written in PHP.
Similar to a typical proxy server, a
web-proxy script downloads requested
web pages and files and forwards them
back to the user. The service is
provided by a web page itself, which
allows instant access to the proxy
without editing your browser
connection settings.
And its license doesn't seem to be GPL : their Licenses pages says :
Glype proxy is free to use on the
condition that the copyright link back
to glype.com must always remain
visible. You can buy a license to
remove this link.
You can buy either a single domain
license or an IP address license
The same kind of thing is said on the download page, in the LICENSE.txt file you get after downloading it, and in the source files ; there is no mention of the GPL.
So, this might be OK for you...
I have not tested it, though ; so I don't know how well it works -- but you can test it without paying anything, so it might be worth a shot ?
Yes, you have to include a link somewhere, or pay a few dollars to get a license -- well, you cannot get everything for free either ^^
And developping your own proxy will take lots of time, and will end up costing a lot more than 10 or 25 dollars...