Network Defense



OSSIM is the de facto standard Open Source SIEM. The goal of AlienVault's OSSIM is to provide a comprehensive compilation of tools that work together to provide a detailed view over each and every aspect of your networks, hosts, physical access devices, server, etc.


I2P is an anonymizing network, offering a simple layer that identity-sensitive applications can use to securely communicate. All data is wrapped with several layers of encryption, and the network is both distributed and dynamic, with no trusted parties.

Voip Hopper

VoIP Hopper is a GPLv3 licensed security tool, written in C, that rapidly runs a VLAN Hop security test. VoIP Hopper is a VoIP infrastructure security testing tool but also a tool that can be used to test the (in)security of VLANs.


ThreatSentry combines a state-of-the-art Web Application Firewall and advanced behavioral components to block any activity falling outside of trusted parameters. ThreatSentry delivers enterprise-grade, multi-layered protection and compliance


tcp-over-dns contains a special dns server and a special dns client. The client and server work in tandem to provide a TCP (and UDP!) tunnel through the standard DNS protocol.

Atelier Web Firewall Tester

AWFT tries different techniques for gaining access to the outside World without being stopped by your Personal Firewall. Many firewalls fail all tests in the default configuration. In the unlikely event your Personal Firewall passes all tests, please congratulate yourself.


Ethereal is used by network professionals around the world for troubleshooting, analysis, software and protocol development, and education. It has all of the standard features you would expect in a protocol analyzer, and several features not seen in any other product. Its open source license allows talented experts in the networking community to add enhancements. It runs on all popular computing platforms, including Unix, Linux, and Windows.

Updated/new name: Wireshark


OmniPeek gives network engineers real-time visibility and Expert Analysis into every part of the network from a single interface, including Ethernet, Gigabit, 10 Gigabit, 802.11a/b/g/n wireless, VoIP, and Video to remote offices. Using OmniPeek’s intuitive user interface and "top-down" approach to visualizing network conditions, network engineers—even junior staff—can quickly analyze, drill down and fix performance bottlenecks across multiple network segments, maximizing uptime and user satisfaction.


Packetyzer is a network protocol analyzer for Windows, also know as a packet sniffer. It is based on the Ethereal project, but provides a native Windows GUI. Packetyzer can capture from virtually any network adapter and supports many advanced features.

Dradis Framework

Dradis is an open source framework to enable effective information sharing, specially during security assessments. It is also is a self-contained web application that provides a centralised repository of information to keep track of what has been done so far, and what is still ahead.

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