http://www.bastille-linux.org/
A script for helping you to make a linux-based more secure
http://www.smoothwall.org/about/
A free and very capable linux-based firewall.
If you have a spare old PC and want to run a real firewall, separate from the PC where you store all you data this is well worth a look
Useful info and tests on how websites snoop on you
(Note: The Analyzer has moved to http://network-tools.com/analyze/)
Another linux based distribution for connection a number of pcs to the Net, and protecting them as well
http://www.analogx.com/contents/news.htm
This site provides quality free software a client for checking your PC's clock against an atomic standard.
You need that kind of accuracy if you want to report an attacker to an ISP
a quality free packet sniffer for finding out what is really happening on a network or over your modem. An excellent
tool if you are learning about TCP/IP.
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