Snort-IDS&IPS tools

Snort is an open source network intrusion prevention and  detection system (IDS/IPS) developed by Sourcefire. Combining the benefits of signature, protocol, and anomaly-based inspection, Snort is the most widely deployed IDS/IPS technology worldwide. With millions of downloads and nearly 400,000 registered users, Snort has become the de facto standard for IPS.    

More detail please read http://www.snort.org/

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