Snort
A free lightweight network intrusion detection system for UNIX and Windows.
ACID (Analysis Console for Intrusion Databases)
Powerful PHP-based data analysis tool for network security events captured by many common IDS tools, including snort and tcpdump.
Advanced Intrusion Detection Environment
AIDE is a file integrity checker that supports regular expressions. Licensed with GPL.
The Bleeding Edge of Snort
Bleeding Snort was a response to the need for a centralized spot for Snort Signatures to be aggregated and maintained. Contains snort rules for malware, viruses, and "0day" exploits.
Chkrootkit
Provides open source application to check for presence of rootkits installed on Linux/Unix machines. Links to security related sites.
Fail2Ban
fail2ban is a POSIX/Linux tool used to ban IP addresses that generate too many password failures. ssh, iptables, ipfwadm and ipfw are currently supported.
Fairly Fast Packet Filter
The Fairly Fast Packet Filter (FFPF) is a network monitoring framework for Linux. FFPF achieves high throughput by pushing computationally intensive tasks to the kernel or even network processors and by minimising packet copying.
Firestorm Network Intrusion Detection System
Firestorm is a high-performance GPL-licensed network intrusion detection system (NIDS). Features include being fully pluggable, easily configurable, and an extremely scalable signature engine.
Honeyd
Small daemon that creates virtual hosts on a network (honeypot). Can be used as a virtual honeynet or for network monitoring. For *BSD, GNU/Linux, and Solaris.
IDABench
IDABench is a pluggable framework for intrusion analysis built upon the Naval Surface Warfare Center, Dahlgren Division's SHADOW versions 1.7 and 1.8. Scripts can be extended via plugins that pass packet data to (and output from) most libpcap-based tools.
Idsa
Experimental intrusion detection system and reference monitor designed to run at application level. For Linux. GPL/LGPL.
LAk Intrusion Prevention System
A single compilation of source, binaries, scripts and whitepapers on intrusion prevention systems. The aim is to quickly establish a working IPS within minutes.
LIDS Project - Secure Linux System
LIDS is an enhancement for the Linux kernel written by Xie Huagang and Philippe Biondi. It implements several security features that are not in the Linux kernel natively. Some of these include: mandatory access controls (MAC), a port scan detector, file protection (even from root), and process protection.
myNetWatchman.com
Intrusion Reporting and Response. Users forward firewall logs that are aggregated and analysed to identify incidents that are reported to the responsible party.
Open-Source IDS
A complete intrusion detection system created with well known open-source tools. Implemented using a custom RedHat 7.2 distribution and available for download as a stand-alone ISO image.
The Osiris Scripts
A tripwire-like utility which uses MD5 to check files for modifications.
Panoptis
Network-IDS that detects and stops DoS/DDoS attacks by using real-time Cisco NetFlow data.
Passive OS Fingerprinting (pOf)
An advanced passive OS/network fingerprinting utility for use in IDS environments, honeypots environments, firewalls and servers.
Prelude hybride opensource IDS
Prelude is a new innovative hybrid Intrusion Detection system designed to be very modular, distributed, rock solid and fast.
QuIDScor IDS/VA correlation
QuIDScor is an Open Source project demonstrating the value in correlating information between Intrusion Detection Systems (such as Snort) and vulnerability assesment and management platforms such as QualysGuard.
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