IPTraf is a console-based network statistics utility that gathers TCP connection paket and byte counts, interface statistics, and activity indicators. Also captures all TCP/UDP packets.
A circuit-level firewall and proxy that can be used to provide convenient and secure network connectivity to a wide range of hosts. Very similar to a SOCKS implementation.
A log analysis program that interfaces with the SNORT open source Intrusion Detection System to provide real time visual notification when an intrusion signature has been detected on the network.
Performs emulation of other operating systems and vulnerabilities not found on the host; in order to deceive and solicit invalid attempts of exploitation by malicious individuals.
A packet sniffing tool, based on the Berkeley packet capture library; that prints complete data-link, network, and transport layer header information for all packets it sees.