Theres a website which offers free public proxy servers through severe pain. You literally have to copy and paste them line by line, both ip’s and ports.

It even has some sort of code obfuscator which is constantly changing the HTML code so people like me couldn’t make themselves a friendly list to copy. That pissed me off even more and now i am going to publish their list on abc code hack to whoever wants it.

Free public proxy servers list .

Also you might want to get your hands on a proxy checker because they die quickly.

I found quite useful one from http://www.optinsoft.com/ – just check under their “Free Software” text on the right if you have hard time finding it.
Oh and on a side note, these are mostly HTTPS proxies but there are some HTTP ones too.