OSSEC is an Open Source Host-based Intrusion Detection System. It performs log analysis, integrity checking, Windows registry monitoring, rootkit detection, time-based alerting and active response.

It runs on most operating systems, including Linux, OpenBSD, FreeBSD, MacOS, Solaris and Windows.

OSSEC Links

License:

Open Source

Home Page:

http://www.ossec.net/

Installation:

http://www.ossec.net/wiki/index.php/InstallGuides

Support Mailing List:

http://www.ossec.net/en/mailing_lists.html