Shield is an aggressive, modular firewall script for iptables which features easy configuration through a BSD-style configuration file, optional NAT support, TCP-wrapper-like functionality for service access, port forwarding, routable protection, DMZ support, and more.
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The Linux Intrusion Detection System is a patch which enhances the kernel's security. When it's in effect, many system administration operations can be made impossible even for root. You can turn the security protection on or off on the fly and you can hide sensitive processes and prevent anyone from using ptrace or any other capability on your system. LIDS can also provide raw device and I/O access protection.
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Zorp is a new-generation modular proxy firewall suite to fine tune proxy decisions with its built in script language, fully analyze complex protocols (like SSH with several forwarded TCP connections), and utilize out of band authentication techniques (unlike common practices where proxy authentication had to be hacked into the protocol).
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LOMAC is a security enhancement for Linux that uses Low Water-Mark Mandatory Access Control to protect the integrity of processes and data from viruses, Trojan horses, malicious remote users, and compromised root daemons. LOMAC is implemented as a loadable kernel module - no kernel recompilations or changes to existing applications are required. Although not all the planned features are currently implemented, it presently provides sufficient protection to thwart script-kiddies, and is stable enough for everyday use. Whitepaper available here.
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BitchX is a popular IRC client which is a modified clone of the popular ircII client. It is available for almost all UNIX OS's as well as Win95/NT and OS/2.
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