Nmap ("Network Mapper") is a free and open source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.

NMAP Cheat Sheet Link

Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol.

Netcat Cheat Sheet Link

Snort is an open-source, free and lightweight network intrusion detection system (NIDS) software for Linux and Windows to detect emerging threats.

Snort IDS Cheat Sheet Link

Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 6700 potentially dangerous files/programs, checks for outdated versions of over 1250 servers, and version specific problems on over 270 servers.

Nikto Cheat Sheet Link

Splunk Enterprise Security is the analytics-driven SIEM solution that gives you the ability to quickly detect and respond to internal and external attacks.

Splunk Cheat Sheet Link

Wireshark is the world’s foremost and widely-used network protocol analyzer. It lets you see what’s happening on your network at a microscopic level and is the de facto (and often de jure) standard across many commercial and non-profit enterprises, government agencies, and educational institutions.

Wireshark Cheat Sheet Link

tcpdump is a data-network packet analyzer computer program that runs under a command line interface. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached.

tcpdump Cheat Sheet Link

The Metasploit Project is a computer security project that provides information about security vulnerabilities and aids in penetration testing and IDS signature development.

Metasploit Cheat Sheet Link

PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and the associated scripting language.

Powershell Cheat Sheet Link

PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and the associated scripting language.

Windows & Linux Command Line Cheat Sheet Link