NMAP:Nmap is an abbreviation of 'Network Mapper', and it's very well known free open source hackers tool. Nmap is mainly used for network discovery and security auditing. Literally, thousands of system admins all around the world will use nmap for network inventory, check for open ports, manage service upgrade schedules, and monitor host or service uptime.
Aircrack-ng:The Aircrack suite of Wifi (Wireless) hacking tools are legendary because they are very effectively when used in the right hands. For those new to this wireless-specific hacking program, Aircrack-ng is an 802.11 WEP and WPA-PSK keys cracking hacking tool that can recover keys when sufficient data packets have been captured (in monitor mode).
Wireshark: Wireshark essentially captures data packets in a network in real time and then displays the data in human-readable format (verbose). The tool (platform) has been highly developed and it includes filters, color-coding and other features that lets the user dig deep into network traffic and inspect individual packets.
Metasploit:The Metasploit Project is a hugely popular pentesting or hacking framework. If you are new to Metasploit think of it as a 'collection of hacking tools and frameworks' that can be used to execute various tasks. Widely used by cybersecurity professionals and ethical hackers this is a tool that you have to learn. Metasploit is essentially a computer security project (framework) that provides the user with vital information regarding known security vulnerabilities and helps to formulate penetration testing and IDS testing plans, strategies and methodologies for exploitation.
Duo-security: Two-factor authentication (2FA) strengthens access security by requiring two methods (also referred to as factors) to verify your identity. These factors can include something you know - like a username and password, plus something you have - like a smartphone app to approve authentication requests.