An easy-to-use anti-spam email gateway

A free utility that finds malware and other threats

Metasploitable is an intentionally vulnerable Linux virtual machine

Tools to work with android .dex and java .class files

Easy to use pentesting distribution for wireless security enthusiasts

UDP Flood Attack Tool

Open source disk encryption with strong security for the Paranoid

An open-source x64/x32 debugger for windows.

Free and Open Source Browser based Security Framework

Cloud friendly pentesting OS for security, anonimity, cryptography etc

A multi-platform universal log collector and forwarder

Portable version of the Tor Browser

A network security analysis and monitoring toolkit Linux distribution.

Endian Firewall Community (EFW) is a "turn-key" linux security distribution that makes your system a full featured security appliance with Unified Threat Management (UTM) functionalities. The software has been designed for the best usability: very easy to install, use and manage and still greatly flexible. The feature suite includes stateful packet inspection firewall, application-level proxies for various protocols (HTTP, FTP, POP3, SMTP) with antivirus support, virus and spam-filtering for email traffic (POP and SMTP), content filtering of Web traffic and a "hassle free" VPN solution (based on both OpenVPN and IPsec).

4MLinux fork including ClamAV scanner

A fast, secure, stable web browser powered by Chromium and Trident.

Liberté Linux: Mission-critical stealth communication

Mount EncFS folders - multiplatform style.

OptOSS Next Gen Network Management System (NG-NetMS)

The CMDB is the central resource for IT administrators and managers.

Web Security Dojo is a preconfigured, stand-alone training environment for Web Application Security. Virtualbox and VMware versions for download. See "View all files" for VMware version.

Xplico is a Network Forensic Analysis Tool (NFAT)

Fingerprint recognition library for .NET and experimentally for Java

Open Source Penetration Testing / Ethical Hacking Framework

Honeypots in a box! HoneyDrive is the premier honeypot bundle distro.