Proxying, filtering cache server. Speeds up surfing and can block ad banners. Also has privacy features such as selective cookie filtering, changing HTTP referrer and browser name. [Open Source, GPL] Development has been suspended due to security issues.

Generic TCP/IP proxy. Handles UDP as well as TCP. [Open Source, GPL]

SecurityFocus reports the Java Anonymous Proxy (JAP), used to anonymise access to the Internet, has been back-doored by court order.

A HTTP tunnel for POP and SMTP to allow access from behind a firewall and acts as a local POP and SMTP server. It uses SWT for the GUI. [Free software, MIT]

Supports SOCKS4 and SOCKS5 protocols, and Identd authentication. [Open Source, GPL]

Lets users access computers behind a firewall. Includes SOCKS and Web proxy as a user program interface. [Freeware]

Acts as a local proxy between the browser and the insecure Internet. All web pages requested by the browser go directly to JAP, and are multiply encrypted there. The encrypted messages travel through a chain of servers (named Mixes by the inventor of ...

SecurityFocus BugTraq mailing list reports that the court order against the partners of the project has been suspended and the back-dooring functions in JAP were disabled.

A caching HTTP/HTTPS proxy. Pages that pass through the proxy are indexed and can be searched using a built-in HTTP server. [Open Source, GPL]

A deliberately slow proxy to simulate the dial-up modem experience. [Open Source, GPL]