A free software implementation of second-generation onion routing, a system enabling its users to communicate anonymously on the Internet.

Development kit for building custom web proxies/servers. Basic web proxy functionality included as standard. [Windows, Unix, OS/2]

Open source tool allows remote tunneling of TCP based protocols through chain of HTTP proxies.

Creates a virtual two-way data path tunneled in HTTP requests from a computer behind a restrictive firewall, to another system. [Linux]

A benchmarking tool for caching proxies and other web intermediaries. [Unix, Windows]

Anonymous peer-to-peer distributed communication layer built with open source tools and designed to run any traditional Internet service such as Usenet, IRC or Web hosting.

Offer Proxyinspector, a log parsing tool that analyzes internet proxy traffic and produces reports on it. Versions available for several popular Windows proxy servers. [Windows]

A dumb proxy that forwards a TCP/IP stream from a port on one host, to a specified port on another host. Supports logging to syslog. [Unix]

Cachelink software runs local web caching proxies on any number of networked PCs on a LAN. Each PCs cache can retrieve documents from other local proxy caches on that network, which because its over LAN connections is faster than retrieving the page f...

An HTTP metaproxy which allows a user to specify different proxies for particular sites. Use managed from a browser based GUI. [Written in Perl]