Some tools specialize in antivirus, while others focus on spear phishing, network security or scripting. Even the best cybersecurity products can only do a few things very well, and there is no room for error.

Effective products, coupled with in-depth cybersecurity planning, are a must for all. Whether businesses have an in-house security team or outsource these services, every entity needs cybersecurity pros to discover and fix any points of weakness in computer systems. This reality can tax the bottom line, but luckily there are many free cybersecurity tools available.

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Aircrack-ng is a must-have suite of wireless security tools that focus on different aspects of Wi-Fi security. Aircrack-ng focuses on monitoring, attack testing and cracking your Wi-Fi network. This package of tools can capture, analyze and export packet data, spoof access points or routers and crack complex Wi-Fi passwords. The Aircrack-ng suite of programs includes Airdecap-ng, which decrypts WEP or WPA-encrypted capture files; Airodump-ng, a packet sniffer; Airtun-ng, a virtual tunnel interface creator; and Packetforge-ng, which creates encrypted packets for injection. All of it is free and open source.

Burp is a suite of tools specifically focused on debugging and testing web app security. Burp Suite includes a spider for crawling web app content, a randomness tool for testing session tokens and a sophisticated request repeater to resend manipulated requests. The real power of Burp Suite, however, is the intercepting proxy tool, which enables Burp to intercept, inspect, modify and send traffic from the browser to a target. This powerful feature makes it possible to creatively analyze a web app's attack vectors from all angles -- a key reason it's often ranked as one of the best free cybersecurity tools. The community version of Burp Suite is free, but there is also a paid Enterprise Edition designed for enabling testing in DevSecOps.

Defendify is an all-in-one product that provides multiple layers of protection and offers consulting services if needed. With Defendify, organizations can streamline cybersecurity assessments, testing, policies, training, detection and response in one consolidated cybersecurity tool.

Features include cybersecurity risk assessments, technology and data use policies, incident response plans, penetration testing, threat alerts, phishing simulations and cybersecurity awareness training.

Many of the costliest data breaches and ransomware attacks in recent years can be traced back to simple phishing campaigns because many company workers fall for them. One of the best protections is to secretly test your staff to see who is gullible, and for that you can use the free program Gophish. Gophish is open source and provides a full-featured toolkit for security administrators to build their own phishing campaigns with relative ease. The overall goal is not to embarrass staff, but find out who needs greater phishing awareness and foster better security training within their organization.

Created by award-winning cybersecurity thought leader and teacher Troy Hunt, Have I Been Pwned is a website where you enter your email address to check if your address has been revealed in a data breach. Have I Been Pwned's database is filled with billions of usernames, passwords, email addresses and other information that hackers have stolen and published online. Just enter your address in the search box.

Kali Linux is a Debian Linux derivative specifically designed toward testing for security tasks, such as penetration testing, security auditing and digital forensics. Kali includes roughly 600 pre-installed programs, each included to help computer security experts carry out a specific attack, probe or exploit against a target. Aircrack-ng, Nmap, Wireshark and Metasploit are a few of the pre-installed tools that ship with the Kali Linux download.

Similar to Kali Linux but at the application layer rather than OS, the Metasploit Framework can test computer system vulnerabilities or can be used to break into remote systems. It is, in other words, a network penetration "Swiss Army knife" used by both ethical hackers and criminal gangs to probe networks and applications for flaws and weaknesses. There is both a free and a commercial version -- known as the Framework and Pro editions, respectively -- which are available for trial. Both editions are de facto standard for penetration testing with more than 1,500 exploits. Metasploit comes pre-installed on Kali Linux.

Nmap is a free network mapper used to discover network nodes and scan systems for vulnerability. This popular free cybersecurity tool provides methods to find open ports, detect host devices, see which network services are active, fingerprint operating systems and locate potential backdoors.

Nikto is an ultra-powerful, command-line tool useful for uncovering vulnerabilities in web apps, services and web servers. Originally launched in the early 2000s, Nikto is still widely used by both blue and red teams that want to quickly scan web servers for unpatched software, misconfigurations and other security issues. The program also features built-in support for SSL proxies and intrusion detection system evasion. Nikto can run on any computer capable of supporting the Perl programming language.

OpenVAS is an all-in-one vulnerability scanner that comprehensively tests for security holes, misconfigured systems and outdated software. The scanner gets the tests for detecting vulnerabilities from a feed with daily updates. Much of the program's power stems from its built-in programming interface, which enables developers to create custom scans that fit niche needs.

Its capabilities include unauthenticated and authenticated testing, high-level and low-level internet and industrial protocols, performance tuning for large-scale scans and a powerful internal programming language to implement any type of vulnerability test.

OSSEC is a free program for cybersecurity professionals that's been touted as one of the most popular systems for intrusion detection and prevention. Made up of multiple components -- including a server, agent and router monitor -- OSSEC is capable of rootkit detection, system integrity checking, threat alerts and response. One of OSSEC's highlights is its comprehensive log analysis tool, empowering users to compare and contrast log events from many different sources.

Using only strong passwords -- and keeping them secure -- is an essential step in the security of any system. But since a best practice is to use a unique password for every website, app and service, that can get tricky. A good password manager makes it possible to safely store all passwords together so a user only needs to remember one master key rather than dozens of unique passwords. This is especially true for cybersecurity professionals tasked with guarding passwords to mission-critical systems. Fortunately, there are free password management tools. Three good, free options for cybersecurity pros are KeePass, Bitwarden and Psono.

The firewall/router software pfSense can be installed on either a physical computer or virtual machine to protect networks. PfSense is based on the FreeBSD OS, and has become one of the most popular open source firewall/router projects available. PfSense can also be configured for intrusion detection and prevention, traffic shaping, load balancing and content filtering. The pfSense site includes a tour, a community page, a link to both training and support and a download of the latest version of the community edition of the software.

Endpoint fingerprinting is analysis of web traffic to find patterns, responses and packets sent and received in a particular direction -- even if they are encrypted. This works even with "dumb" devices that don't interact with the network but can still enable unauthorized access to an organization's systems.

P0f is a simple yet powerful network-level fingerprinting and forensics program. While other free cybersecurity programs do a similar job, p0f is unique in that it's designed for stealth. Where most other programs rely on active scanning and packet injection, p0f can identify fingerprints and other vital information without network interference. Being passive rather than active means p0f is nearly impossible to detect and even harder to block, making it a favorite tool for ethical hackers and cybercriminals alike.

Normally the dissection and examination of malware is left to the antimalware vendors. But if you would like to do the job yourself, there is REMnux, a free Linux toolkit for reverse-engineering and analyzing malware.

Included in every REMnux distribution are tools to analyze Windows executables, reverse-engineer binaries and inspect suspicious documents. It also includes a collection of free tools cybersecurity professionals can use to monitor networks, gather data and conduct memory forensics.

Security Onion is an open source software collection based on the Linux kernel that helps cybersecurity professionals develop a comprehensive profile of their system's security posture. Security Onion provides network monitoring using full packet capture, host-based and network-based intrusion detection systems, log indexing, search and data visualization features.

The operating system emphasizes ease of use and makes it possible to interweave data and analytics from multiple tools into a unified dashboard. The overarching goal of the project is to offer teams a foolproof security monitoring solution that reduces decision paralysis and false alerts.

Snort is an open source network intrusion prevention and intrusion detection system capable of real-time traffic analysis and logging. It uses a series of rules to identify malicious network activity, find the packets and generate alerts. This packet sniffer -- managed by Cisco -- actively searches and analyzes networks to detect probes, attacks and intrusions. Snort accomplishes this by fusing a sniffer, packet logger and intrusion detection engine into a single package. 152ee80cbc

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