Nmap: A powerful and widely used open-source network scanning tool that helps discover hosts and services on a computer network, thus creating a "map" of the network.
Wireshark: A popular network protocol analyzer that allows security professionals to capture and inspect network traffic in real-time to identify vulnerabilities or potential security issues.
Metasploit Framework: An advanced open-source penetration testing platform that enables security researchers to identify, exploit, and validate vulnerabilities in target systems.
Burp Suite: A comprehensive web application security testing tool that aids in identifying and fixing vulnerabilities in web applications.
Nikto: A web server scanner that checks for potential security issues, such as outdated software versions and known vulnerabilities.
OWASP ZAP (Zed Attack Proxy): An open-source web application security scanner designed to help find security vulnerabilities in web applications.
SQLMap: An open-source penetration testing tool that automates the process of detecting and exploiting SQL injection vulnerabilities in web applications.
Acunetix: A web vulnerability scanner that identifies security flaws in web applications, including SQL injection, cross-site scripting (XSS), and other vulnerabilities.
Gobuster: A directory and file brute-forcing tool that helps identify hidden files and directories on web servers.
Aircrack-ng: A suite of tools used for assessing and cracking Wi-Fi network security, including WEP and WPA/WPA2 encryption.
John the Ripper: A powerful password-cracking tool that can help identify weak passwords or perform password audits.
OpenVAS: An open-source vulnerability assessment scanner that can identify and assess potential vulnerabilities in systems and networks.
Snort: An open-source intrusion detection system (IDS) that monitors network traffic for suspicious activity and potential security breaches.
GnuPG (GPG): A free and open-source implementation of the OpenPGP standard, used for encrypting and decrypting data, as well as verifying digital signatures.
Hashcat: An advanced password recovery tool that can crack a wide range of password hashes through brute-force, dictionary attacks, and other methods.