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.
http://www.andrew.cmu.edu/~rdanyliw/snort/snortacid.html
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Advanced Intrusion Detection Environment
AIDE is a file integrity checker that supports regular expressions. Licensed with GPL.
http://www.cs.tut.fi/~rammer/aide.html
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Chkrootkit
Provides open source application to check for presence of rootkits installed on Linux/Unix machines. Links to security related sites.
http://www.chkrootkit.org/
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Honeyd
Small daemon that creates virtual hosts on a network (honeypot). Can be used as a virtual honeynet, for network monitoring, or as a spam trap. For *BSD, GNU/Linux, and Solaris.
http://www.citi.umich.edu/u/provos/honeyd/
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Idsa
Experimental intrusion detection system and reference monitor designed to run at application level. For Linux. GPL/LGPL.
http://jade.cs.uct.ac.za/idsa/
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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.
http://lak-ips.sourceforge.net/
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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 p
http://www.lids.org
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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.
http://www.mynetwatchman.com/
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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.
http://www.ids.belbone.be
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The Osiris Scripts
A tripwire-like utility which uses MD5 to check files for modifications.
http://www.shmoo.com/osiris
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