Scapy is a Python-based interactive packet manipulation program
A cross-platform network scanner that is fast and simple to use
Open Source Monitoring System for performance and availability.
Nagios network monitoring software is enterprise server monitoring
Firewall log analyzer
Zenoss - Intelligent IT Operations Management
3D Network Traffic Visualisation
A simple, portable port scanner
Stream manager
Copy payload data from Wireshark .pcap files(s) to file
Snare Enterprise: bit.ly/Snare-Trial
Portable Bulk File Renamer, Folder monitor. All in one.