Free and Open-Source Software

Free and Open-Source Software (FOSS) is software that is Free Software and Open-Source Software. There is so much FOSS in the security domain that I believe this warrants its own wiki page.

A

AirCrack-NG - A complete suite of tools to assess WiFi network security

Angry IP Scanner - A port and host scanner for Windows.

B

Burp Suite Community Edition - Web Application testing software

C

Cain and Abel - A freely available Windows password sniffer and cracker

H

Hash Suite - A Windows-based high-performance password cracker

I

IPTables - The userspace command line program used to configure the Linux 2.4.x and later packet filtering rulesets

J

John the Ripper - A multi-platform password cracker

L

L0phtCrack - An open-source password hash cracker

M

Medusa - The massively speedy, highly parallel, modular login brute-forcing password cracker

N

NCrack - A high-speed, multi-platform network authentication cracking tool

Nikto - A free command-line utility vulnerability scanner

NMap - A network discovery and security auditing port/host scanner

O

ophCrack - An open-source Windows-password cracking program

S

Snort (Community Ruleset) - A free and open-source network intrusion detection system (NIDS) and intrusion prevention system (IPS)

T

tcpdump - A powerful command-line packet analyzer

THC-Hydra - A GPLed proof-of-concept password cracking tool

W

Wfuzz - A web application security assessment tool

Wireshark - The world’s foremost, widely-used network protocol analyzer

Z

Zed Attack Proxy - The world's most widely used web application scanner