Tailbeep opens a file (-f), seeks to the end, and watches for a string (-s). If the string is found, a beep is sent to the specified tty (-t) device. You can also daemonize (-d) it. I wrote it so I could watch /var/log/messages for the DENY string (so I can tell if someone is trying to break into the firewall).
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Probe 4.1 is a host scanner compilation for Linux, featuring nmap, snmpscan, netbios auditing tool and super-cool vh shell script.
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THC-Hydra is the world's first parallel login hacker. With this tool you are able to attack several services at once.
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This is the OpenBSD version of OpenSSH, a suite of tools which encrypts network traffic. OpenSSH is based on the last free version of Tatu Ylonen's SSH with all patent-encumbered algorithms removed, all known security bugs fixed, new features reintroduced, and many other clean-ups.
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All versions of the OpenSSH ssh client prior to 2.3.0 have a vulnerability which allows malicious OpenSSH servers to turn on port forwarding even if it is disabled in the client configuration, allowing hostile servers can access your X11 display or your ssh-agent. Newest version available here.
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Openwall.c is a local root exploit in LBNL traceroute v1.4a5 which executes the heap instead of the stack, avoiding the openwall kernel patch.
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Traceroot2.c - Improved local root exploit in LBNL traceroute v1.4a5. Tested against Debian GNU/Linux 2.2 x86 and sparc, and Red Hat 6.2 x86. Advisory on this issue available here.
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FCheck is a very stable perl script written to generate and comparatively monitor a UNIX system against its baseline for any file alterations and report them through syslog, console, or any log monitoring interface. Monitoring events can be done very frequently if a system's drive space is small enough, making it more difficult to circumvent. This is a freely-available open-source alternative to 'tripwire' that is time tested, and is easier to configure and use.
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