We’ve only mentioned one HIDS before, that was OSSEC HIDS, so I thought I’d do some updates on the others.
Samhain has always been one of my favourites, before that of course I was using Tripwire like everyone else.

The Samhain open source host-based intrusion detection system (HIDS) provides file integrity checking and logfile monitoring/analysis, as well [...]

The Web Security Gateway is a security-centric distribution of the Apache web server, bundled with additional security modules, and configured as a front-end (reverse) HTTP proxy. The goal is to mirror most of the features of commercial web application “firewalls”, with free and Open-Source software.
The Web Security Gateway provides a configurable caching, authentication, input validation, [...]

This tool is another one on the side of protection, again for web-based applications but this time for .NET applications it’s called .NETIDS (.NET Intrusion detection System). This tool is capable of detecting on attacks on web applications and gives the developer the possibility to react. The project files include filter rules and function stubs [...]

Another protection for those building website and web applications, as it’s the the most common attack vector nowadays I think it’s important to be extra safe on this front.
PHPIDS (PHP-Intrusion Detection System) is a simple to use, well structured, fast and state-of-the-art security layer for your PHP based web application. The IDS neither strips, sanitizes [...]

The Firewall Tester (FTester) is a tool designed for testing firewalls filtering policies and Intrusion Detection System (IDS) capabilities.
The tool consists of two perl scripts, a packet injector (ftest) and the listening sniffer (ftestd). The first script injects custom packets, defined in ftest.conf, with a signature in the data part while the sniffer listens for [...]

Sguil (pronounced sgweel) is probably best described as an aggregation system for network security monitoring tools. It ties your IDS alerts into a database of TCP/IP sessions, full content packet logs and other information. When you’ve identified an alert that needs more investigation, the sguil client provides you with seamless access to the data you [...]

Hackers are switching targets now, companies are getting too hard to break into due to the availability of decently configured perimeter kit like firewalls and IDS.
Plus the information they do get if they manage to break in is often worthless commercially and really not worth the effort.
So instead, they target the end user, home bankers, [...]

It’s good to see work on open source tools in the countermeasure department aswell as the attack and penetration arena.
It’s a shame since Snort and Nessus have gone semi-commercial.

I hope more people invest their time in good IDS, Firewall and IPS systems, I love things like IPCop and hope to see more products like HLBR.
HLBR [...]

Another good tool updated! TCPReplay suite 3.0.beta10 has been released.
For those that don’t know Tcpreplay is a suite of BSD licensed tools written by Aaron Turner for *NIX operating systems which gives you the ability to use previously captured traffic in libpcap format to test a variety of network devices. It allows you to classify [...]

We are happy to announce that the 1.2.6 (christine) release of the Basic Analysis and Security Engine (BASE) is available.

BASE is the Basic Analysis and Security Engine. It is based on the code from the Analysis Console for Intrusion Databases (ACID) project. This application provides a web front-end to query and analyze the alerts [...]