VTun is the easiest way to create Virtual Tunnels over TCP/IP networks with traffic shaping, compression, and encryption. It is a user space implementation and doesn't need modification of any kernel parts. VTun supports IP, PPP, SLIP, Ethernet, and other tunnel types. VTun is easily and highly configurable; it can be used for various network tasks like VPN, Mobil IP, Shaped Internet access, Ethernet tunnel, IP address saving, etc.
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The Anomy mail sanitizer is a filter designed to block email-based attacks such as trojans and viruses. It reads an RFC822 or MIME message and removes or renames attachments, truncate unusually long MIME header fields and sanitizes HTML by disabling Javascript and Java. It uses a single-pass pure Perl MIME parser, which can make it both more efficient and more precise than other similar programs and has built-in support for third-party virus scanners.
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Crank is short for "CRyptANalysis toolKit", and its overall purpose is to provide a powerful and extensible GUI environment for solving classical (pen-and-paper) ciphers, providing as much automation as possible. Initial focus is on the cryptanalysis of monoalphabetic substitution ciphers. Screenshot here.
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Nessus is a free, up-to-date, and full featured remote security scanner for Linux, BSD, Solaris and some other systems. It is multithreaded, plugin-based, has a nice GTK interface, and currently performs over 531 remote security checks. It has powerful reporting capabilities (HTML, LaTeX, ASCII text) and not only points out problems, but suggests a solution for each of them. Windows version available here.
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Virge is mail scanner written in C which requires Sendmail, and AVPDaemon or Sophie (for virus checking). It can check mail for virii, and also for attachment names (regular expressions, full names, etc). It scans mail for virii very quickly, since the virus scanners used are always loaded in memory.
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Format String Builder includes code and instructions for use of a program which aids in the creation of format string exploits. Includes fmtbuilder.c, a small program to help build the strings.
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Udppipe.c is a udp redirector, similar to TCP's datapipe.c. It can be used to play OICQ behind firewall.
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Hogwash is designed to take out 95% of the stock attacks all the kiddies throw at your network by dropping packets flagged by Snort. Hogwash is a layer 2 packet scrubber which sits in line, dropping packets based on signature matches. The rule set will be familiar to anyone that has used snort before. Hogwash supports passive host identification and adaptive rule sets for added accuracy.
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Resolv-0.9.c is a program which resolves a range of IP addresses. Includes logging, search patterns, and displays aliases.
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Ctrace is a multiprotocol traceroute tool, written in perl.
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