CGI Proxy is a free script that is on many web pages and is a HTTP or FTP proxy. What this means is that through CGI Proxy, you can access any website that the server running it can. For example, some organizations may block the URL "http://www.hotornot.com" with their firewall, but by using CGI Proxy you can get around this blockage.
As well as providing a method to access blocked web pages, CGI Proxy can also provide some degree of anonymity. Although it is not fail proof, it can stop the website you are viewing from knowing more about you.
When an HTML resource is retrieved, it's modified so that all links in it point back through the same proxy, including images, form submissions, and everything else. Once you're using the proxy, you can browse normally and (almost) forget it's there.
The CGI Proxy script is provided free at jmarshall.com/tools/cgiproxy/, but if you just want to use it, there are many sites that let you.
Finding a site that allows you access to this script, is quite simple. As the filename of the script is normally nph-proxy.pl or nph-proxy.cgi, we can use Google to look for sites with pages matching this filename:
Another way of finding sites that allows you access to this script, is to search for the phrase "start using cgiproxy"
You will find that the first page might be no long active, blocked or require a subscription. Just go to the next page of results and you will soon find a page offering use of CGI Proxy or that links to another page offering access to CGI Proxy.