Polipo - A small and fast caching web proxy (a web cache, an HTTP proxy, a proxy server).
PHP-Proxy - A web proxy script written in PHP and created as an alternative to Glype.
ExaProxy - ExaProxy is a a high-performance non-caching proxy.
PHProxy - PHProxy is a web proxy for bypass proxy restrictions and get access to the Web sites blocked by PHP...
Privoxy - Privoxy helps users to protect their privacy.
Censor Dodge - The fastest and most up-to-date web proxy on the market.