Lsof is an extremely powerful unix diagnostic tool. Its name stands for LiSt Open Files, and it does just that. It lists information about any files that are open by processes currently running on the system. It easily pinpoints which process is using each network connection / open port. FAQ available here.
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RATS, the Rough Auditing Tool for Security, is a security auditing utility for C, C++, Python, Perl and PHP code. RATS scans source code, finding potentially dangerous function calls.
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Chrootuid makes it easy to run a network service at a low privilege level and with restricted file system access.
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A remote buffer overflow vulnerability has been found in ActivePerl PerlIS.dll, affecting Microsoft IIS 4 and 5 servers with ActivePerl 5.6.1.629 and earlier versions installed.
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