linsec TWiki
linsec TWiki is a web-based collaboration tool for a personal project detailing security on Linux in particular, but any *NIX-ish operating system (ie. OpenBSD, Mac OS X, etc.).
Discover How To Harden My Filesystem HOWTOs
Knocker
Knocker is a simple and easy to use TCP security port scanner written in C to analyze hosts and all of the different services started on them.
Kismet
Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic.
John the Ripper password cracker
John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), DOS, Win32, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords.
flawfinder
This is the main web site for flawfinder, a program that examines source code and reports possible security weaknesses (``flaws'') sorted by risk level. It's very useful for quickly finding and removing at least some potential security problems befor
ettercap
Ettercap is a suite for man in the middle attacks on LAN. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols (even ciphered ones) and
