PSAD detects port scans and other suspect traffic. GPL

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Port Scan Attack Detector 1.4.7 (Default branch)
The Port Scan Attack Detector (psad) is a collection of three system daemons that are designed to work with the Linux Netfilter firewalling code to detect port scans and other suspect traffic. It features a set of highly configurable danger thresholds (with sensible defaults), verbose alert messages, email alerting, DShield reporting, and automatic blocking of offending IP addresses. Psad incorporates many of the packet signatures included in Snort to detect various kinds of suspicious scans, and implements the same passive OS fingerprinting algorithm used by p0f."