Snort

   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. Snort has become the de facto standard for Intrusion Prevention Systems (IPS).


   Martin Roesch remains the guiding force behind nearly all of the
improvements made to Snort. Despite business pressures that
could potentially sidetrack any vendor's technology improvements,
Roesch guides Snort with a steady hand. He created Snort as an open
source project in 1998 and in 2001 he founded Columbia, Md.-based
Sourcefire to sell appliances and software that uses the Snort
engine.