Category
page 1Intrusion detection systems
intrusion detection system
a device or software application that monitors a network or systems for malicious activity
Snort
free software intrusion prevention system
host-based intrusion detection system
intrusion detection system
network tap
hardware device to access the data flowing across a computer network

Open Source Tripwire
free software
Suricata
open source security software
OSSEC
OSSEC (Open Source HIDS SECurity) is a free, open-source host-based intrusion detection system (HIDS). It performs log analysis, integrity checking, Windows registry monitoring, rootkit detection, time-based alerting, and active response. It provides intrusion detection for most operating systems, including Linux, OpenBSD, FreeBSD, OS X, Solaris and Windows. OSSEC has a centralized, cross-platform architecture allowing multiple systems to be easily monitored and managed. OSSEC has a log analysis engine that is able to correlate and analyze logs from multiple devices and formats.
Advanced Intrusion Detection Environment
free software