For web proxies: www.delete-computer-history.com/web-base-proxy-sites.html
Many students and employees want to know how to unblock a website. You can access a blocked website by using proxy servers. Web proxies can be accessed easily on the web by simply typing the desired website address. You may have to manually enter a proxy address also which requires a IP and port number.
Lastly, you can simply get the numerical IP address and use that to access the blocked site. This only works if the website is blocked by name and not IP.