Using proxy servers makes it easy to access blocked web sites as well as maintain online anonymity when visiting websites that may turn out to be malicious in nature.
Here are 5 reliable free proxy websites that help and are sufficient for casual internet surfing although anonymously :
1. Hide My Ass! : This site offers free web proxy to surf sites anonymously, free anonymous emailing as well as paid plans that use VPNs for encrypting online communications.
2. Free Proxy Server : This offers free web proxies for anonymous surfing in easy to use manner.Use the available CGI proxy to access emails, social networking websites and so on.
3. YouHide : Simple web proxy for internet surfing, simple and uncluttered interface.Totally free for all.
4. Proxify : Offers free as well as paid plans.Paid plans include the benefits of no ads being displayed, no file types restriction, priority support as well as unlimited bandwidth.
5. KProxy : Very popular and offers free and paid plans.Paid plans allow access to private servers and greater download limits as compared to free plans.
Hope you find these sites useful for anonymous surfing.
Update 1 : If you want a detailed idea about how proxy servers work and how they differ from using a VPN to maintain anonymity, check this guide here.
Update 2: There is also a free online proxy listing tool by Geonode that can filter proxies based on location, availability, speed, protocols and more.