I’ve created a LinkedIn Group for supporters of the OSSEC project. To join, please use the following URL: http://www.linkedin.com/e/gis/25424/146D636846D0
If you’re not familiar with OSSEC it is an Open Source Host-based Intrusion Detection System. It performs log analysis, integrity checking, Windows registry monitoring, rootkit detection, real-time alerting and active response.
It runs on most operating systems, including Linux, OpenBSD, FreeBSD, MacOS, Solaris and Windows. I encourage you to visit http://www.ossec.net, download it, and see what you think 🙂