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Backbox

Designed to be fast, easy to use and provide a minimal yet complete desktop environment, thanks to its own software repositories that are constantly updated to the latest stable version of the most popular and best known ethical hacking tools.

Network Security Toolkit (NST)

This bootable ISO live DVD/USB Flash Drive (NST Live) is based on Fedora. The toolkit was designed to provide easy access to best-of-breed Open Source Network Security Applications and should run on most x86_64 systems.

The main intent of developing this toolkit was to provide the security professional and network administrator with a comprehensive set of Open Source Network Security Tools. The majority of tools published in the article: Top 125 Security Tools by INSECURE.ORG are available in the toolkit. An advanced Web User Interface (WUI) is provided for system/network administration, navigation, automation, network monitoring, host geolocation, network analysis and configuration of many network and security applications found within the NST distribution. In the virtual world, NST can be used as a network security analysis validation and monitoring tool on enterprise virtual servers hosting virtual machines.

Metasploit

The world’s most used penetration testing framework
Knowledge is power, especially when it’s shared. A collaboration between the open source community and Rapid7, Metasploit helps security teams do more than just verify vulnerabilities, manage security assessments, and improve security awareness; it empowers and arms defenders to always stay one step (or two) ahead of the game.

BlackArch Linux

BlackArch Linux Provides over 1,330 Penetration Testing Tools

The Top 1,644 Security Open Source Projects

A collection of awesome software, libraries, documents, books, resources and cool stuff about security.

The Top 341 Security Tools Open Source Projects

A collection of awesome software, libraries, documents, books, resources and cool stuff about security.

Sbilly @ GitHub

A collection of awesome software, libraries, documents, books, resources and cool stuff about security.

The Book of Secret Knowledge (GitHub)

Blurb: “This repository is a collection of various materials and tools that I use every day in my work. It contains a lot of useful information gathered in one piece. It is an invaluable source of knowledge for me that I often look back on.”

SecTools (100 Security Tools)