+http://privacy.net/, a useful site
+to check what information about you is leaked while you browse the web.
+
+http://www.squid-cache.org/, a popular
+caching proxy, which is often used together with \fBPrivoxy\fR.
+
+http://www.pps.jussieu.fr/~jch/software/polipo/,
+\fBPolipo\fR is a caching proxy with advanced features
+like pipelining, multiplexing and caching of partial instances. In many setups
+it can be used as \fBSquid\fR replacement.
+
+http://tor.eff.org/,
+\fBTor\fR can help anonymize web browsing,
+web publishing, instant messaging, IRC, SSH, and other applications.
+
+http://www.privoxy.org/developer-manual/,
+the \fBPrivoxy\fR developer manual.