Wireshark is a GTK±based network protocol analyzer that lets you capture and interactively browse the contents of network frames. The goal of the project is to create a commercial-quality analyzer for Unix and Win32 and to give Wireshark features that are missing from closed-source sniffers. This is the source code release.
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AIDE (Advanced Intrusion Detection Environment) is a free replacement for Tripwire™. It generates a database that can be used to check the integrity of files on server. It uses regular expressions for determining which files get added to the database. You can use several message digest algorithms to ensure that the files have not been tampered with.