Monkit - The Monitoring Toolkit
Monkit is an open-source system that allows efficient network monitoring and intrusion detection on standard off-the-shelf hardware. It offers a webinterface for easy configuration and to display results of the IDS Snort, event correlation (Prism++) and flow information (Nfsen). In the background, the monitoring framework Vermont is used to distribute the network data.


(more available here)
Feel free to send any comments, questions, etc. to info@monkit.org.