Wikipedia
CGIProxy is, as its name suggests, a CGI proxy software package. A CGI ( Common Gateway Interface) proxy appears to a user as a web page that allows the user to access a different site through it, in most cases anonymously. An anonymous CGI Proxy is a type of proxy server that works through an encrypted web form embedded on another web page hosted securely using SSL (Secure Socket Layering), also often called a "Web proxy".
CGIProxy is written in the Perl programming language. It can be installed on any web server which can execute a Perl program via CGI, and which supports Non-Parsed Header CGI scripts. Supported protocols include HTTP, FTP and SSL, as well as related technologies: Javascript, Adobe Flash.
CGIProxy development stalled between December 25, 2008, and December 09, 2011 but is now in active development again, with six releases in 2014. The changelog is quite extensive, now including Windows support.