There are several freeware or shareware intrusion detection systems as well as intrusion detection systems.
Here are some of the open source intrusion detection systems:
- AIDE (http://sourceforge.net/projects/aide)
Self-described as “AIDE (Advanced Intrusion Detection Environment) is a free replacement for Tripwire. It does the same things as the semi-free Tripwire and more. There are other free alternatives available, so why build a new one? All other replacements do not achieve the level of Tripwire. And I wanted a program that transcends the limitations of Tripwire. - File System Saint (http://sourceforge.net/projects/fss)
Self-described as “the Saint file system is a lightweight host intrusion detection system based on the priority on speed and ease of use. “ - Snort (www.snort.org)
Self-described as “Snort ® is a source network intrusion prevention and detection system using a rule-based language, combining the benefits of signature, protocol and methods ‘anomaly based inspection. With millions of downloads to date, Snort is the most widely deployed intrusion detection and prevention technology worldwide and has become the de facto standard for the industry. “
Tags: detection systems