Top 10 Cyber Security tools

1. Wireshark: It is a packet sniffing program which was initially known as ethereal moved up one position.Freely available on Windows, Linux, and macOS.
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1. Metasploit: The Metasploit Project is a computer security project that provides information about security vulnerabilities and aids in penetration testing and IDS signature development which works with Windows, Linux, and macOS.

Nessus: Nessus is a proprietary vulnerability scanner developed by Tenable Network  Security. According to surveys done in 2009 by sectools.org, Nessus is the world's most popular vulnerability scanner, taking first place in 2000, 2003, and 2006 security tools survey, Windows, Linux, and macOS are supported.

Aircrack: Aircrack-ng is a network software suite consisting of a detector, packet sniffer, WEP and WPA/WPA2-PSK cracker and analysis tool for 802.11 wireless LANs. It works with any wireless network interface controller whose driver supports raw monitoring mode and can sniff 802.11a, 802.11b, and 802.11g traffic.  Free for Windows, Linux.

                                                                 

1. Snort: Snort is a free open source network intrusion detection system and intrusion prevention system created in 1998 by Martin Roesch, former founder and CTO of Sourcefire. Snort is now developed by Cisco, which purchased Sourcefire in 2013, at which Roesch is a chief security architect. Works on Windows, Linux, and macOS.                  
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4. Cain and Abel: It is a password recovery tool for Microsoft Windows. It can recover many kinds of passwords using methods such as network packet sniffing, cracking various password hashes by using methods such as dictionary attacks, brute force, and cryptanalysis attacks. Free for Windows only. 
5. BackTrack: BackTrack was a Linux distribution that focused on security, based on the Knoppix Linux distribution aimed at digital forensics and penetration testing use. In March 2013, the Offensive Security team rebuilt BackTrack around the Debian distribution and released it under the name Kali Linux. Free for Linux only.

1.  Netcat: Netcat is a computer networking utility for reading from and writing to network connections using TCP or UDP. The command is designed to be a dependable back-end that can be used directly or easily driven by other programs and scripts. Free for Windows, Linux, and MacOS.

1. tcpdump: tcpdump is a common packet analyzer that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license, tcpdump is free software. Free for Windows, Linux, and macOS
2. John The Ripper: John the Ripper is a free password cracking software tool. Initially developed for the Unix operating system, it now runs on fifteen different platforms. Windows, Linux, and macOS are supported