CS 642: Introduction to Information Security (Fall 2007)
A open-source intrusion detection system.
The Snort page
An open-source firewall for linux.
The ipchains page
In there own words:The Freefire Project was founded in Summer '96 by Bernd Eckenfels. Besides beeing a Starting-Point in the Web for seeking free IT Security Solutions a main goal for the Project is to support Developers, Designers and Security Experts in the usage of free Software.
The Freefire homepage
Information about smart cards.
The Smart card homepage