iplog is a TCP/IP traffic logger capable of logging TCP port scans, TCP null scans, FIN scans, UDP and ICMP "smurf" attacks, bogus TCP flags, TCP SYN scans, TCP "Xmas" scans, ICMP ping floods, UDP scans, and IP fragment attacks. It currently runs on Linux, FreeBSD, OpenBSD, BSDI and Solaris.
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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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SAINT (Security Administrator's Integrated Network Tool) is an updated version of SATAN, designed to assess the remote security of computer networks. Features include scanning through a firewall, frequently updated security checks, 4 levels of vulnerability severity, and a feature rich HTML interface.
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