25 Free & Open Source Cybersecurity Tools for Businesses

16 min read

Given their lower prices, you might consider employing various open source and free cybersecurity products for your company. Even though they probably won't offer as many capabilities as professional ones, these are still a fantastic place for those who are new to cybersecurity to start.

Many of the tools work as intended and allow your security team or a third-party software developer to tweak the coding to suit your unique demands and requirements.

Here are the top free and open source cybersecurity technologies for your essential company requirements.

Password managers

These are secure password-based digital safes created to keep track of login credentials for apps, accounts, and websites on mobile devices.

The best password managers have a password generator that can generate strong, unique passwords and make sure you aren't using the same password multiple times in addition to safeguarding your identity, credentials, and sensitive data (password generation really comes in handy when you can't come up with yet another unique password on the fly for the latest must-have iOS app).

It's simple to understand why using a different password for each location will help safeguard you since if one password is stolen, it can't be used on other websites. Just consider the rise in phishing assaults. In essence, you're utilising several passwords to build your own security features.

Let's look at a couple open-source and free password managers that might assist you in maintaining account security:

1. KeePass

Passwords are safely stored with the free and open-source password manager KeePass. KeePass opens by entering a single master key and securely stores passwords in a database. It has total database encryption, which means that usernames, notes, and other data are protected together with the password fields. It is powered by secure encryption methods including AES-256, ChaCha20, and Twofish.

2. NordPass

Argon 2 is used by NordPass for key derivation together with XChaCha20 encryption.
AES-256 encryption would have sufficed on the surface, but this option appears to be more immune to configuration errors and operates up to three times faster.

With compatibility for Windows, macOS, Linux, Android, iOS, and NordPass, you can access your safe vault from any device and save an infinite amount of passwords, notes, and credit cards.

Many customers won't bother to make a strong password. Since they won't memorise them anyway, our solution includes a built-in password generator. As a result, while browsing, you will be able to generate and immediately store it for later.

It's important to keep in mind that the Data Breach Scanner and Password Health services are only available to premium users.

3. Dashlane

The highest standard of cybersecurity, military-grade AES 256-bit encryption, is used by Dashlane. If you want to make your vault even safer, you may also enable 2FA authentication.

Given that you are only allowed to use the password manager with one device, Dashlane may be somewhat restrictive in how you use it. Additionally, Dashlane only permits up to 50 passwords, but the service makes up for it with security alerts. Desktop applications for Windows, macOS, and Linux are included.

4. RoboForm

A RoboForm also employs the military-grade AES-256 cryptography, as one might anticipate.

To take things a step further, you may enable 2FA auth. All of your passwords will be transferred to a secure server, and only your master password can unlock the vault. This will prevent unauthorised access even if someone has access to your master password.
Additionally, there is a local-host option in the free edition, and cloud-hosted RoboForm is an option for paid customers as well.

You can install the solution on any of these operating systems because the software is compatible with Windows, macOS, iOS, and Linux devices. The utility also comes as an add-on for common browsers such as Firefox, Chrome, Opera, Safari, Edge, and even Internet Explorer.

5. LastPass

Due to its use of military-grade encryption that is industry-standard, LastPass is another strong contender for a decent free solution. In this instance, the data is encrypted locally before being transferred to their servers; as a result, neither LastPass nor hackers can access your data. The 2-factor authentication techniques are supported by the password manager.

Authorizing logins with an authenticator app or by employing PINs boosts process confidence and gives you the impression that your extremely confidential data is secure. A sizable number of extra features are available in LastPass, including a password generator with length and character modifiers and an instantaneous vault adding option.

This can then be connected to other devices via sync. For Windows, macOS, Linux, Android, and iOS, LastPass apps are created. It also supports popular browsers like Safari, Opera, and Edge.

Penetration Testing Tools

These open source, free cybersecurity solutions are some of the best ones available when it comes to network security. In layman's terms, the procedure is called pen-testing.

These tools are used by computer security professionals, commonly referred to as white hackers or ethical hackers, to identify and exploit security flaws in computer applications.
It's possible to compare penetration testing to employing security consultants to try a security attack on a fortified facility in order to learn how real criminals may approach executing the real thing. 

On the market, there are quite a few good free such tools and you can find them mentioned below. Do further research on the top free and open-source software.

1. Metasploit

Use this offensive vulnerability testing and exploitation tool to scan your systems for open and known security flaws.

With the ability to scan about 250 ports that are typically open to outside services, Metasploit can be a useful tool for auditing and network port scanning. It works by assisting you in breaking down the penetration testing workflow into manageable portions.

2. Nmap

Network Mapper, often known as Nmap, is used for penetration testing and security auditing because it uses NSE scripts to find security flaws, configuration errors, and vulnerabilities in network services. Network administrators can use it to carry out duties related to network inventory, service upgrade timetables, and uptime monitoring.

Before a security audit begins, it maps out networks and ports so that it may later use scripts to find any obvious security issues. The software uses raw data to identify the different host types, OS varieties, and hosts that are present in the network.

It was created primarily for scanning huge networks and is compatible with Linux, Windows, and Mac OS X.

3. Wireshark

In essence, Wireshark operates by capturing data packets flowing through a network and returning them to the user in a readable format. It enables users to capture data using a variety of devices, including Bluetooth, Ethernet, Wi-Fi, Npcap adapters, and token rings, to mention a few.

4. Nikto

Nikto is an open-source pen testing tool that is distributed under the GPL. It probes a host to detect potential vulnerabilities such as server misconfiguration, outdated software, or even version-specific problems that could endanger the server.

5. John the Ripper

John the Ripper is generally used to conduct dictionary attacks to find weak password vulnerabilities in a network. Aside from having a cool name, it also supports brute force and rainbow crack assaults, and may be launched locally or remotely.


Host-based intrusion detection systems are referred to as HIDS. HIDS is essentially an application that keeps an eye out on a network or computer for various suspicious activities.

The majority of the actions being watched will likely involve, but not necessarily be limited to, intrusions brought about by outside actors as well as by internal misuse of data or resources.
HIDS operate by logging suspicious activity and alerting the administrators in charge of the impacted devices or networks.


OSSEC is a host-based intrusion detection system (HIDS) that is open source, scalable, and multi-platform.

It may face cyber-attacks and system modifications in real-time by making use of the firewall policies in place.

While offering application and system-level auditing for compliance with various widely used standards like PCI-DSS and CIS, it is also able to integrate with third parties and has self-healing capabilities.

Open Source Security Event Correlator, or OSSEC, is a fantastic application that enables you to carry out log analysis, file integrity checks, policy monitoring, rootkit identification, and active response utilising both signature and anomaly detection techniques. To find anomalies, one can gain knowledge into how a system works.

2. Tripwire

Tripwire created his host-based detection technology as an open-source, free product. The software, which is only compatible with Linux distributions, alerts system administrators to corrupt or altered files and assists them in identifying changes to system files.

3. Wazuh

Wazuh 3.8.2 was created with scalability and dependability in mind. This application does log analysis, integrity checking, Windows registry monitoring, and active response in addition to anomaly and signature detection methods to identify rootkits. It can be used to monitor files inside Docker containers and can be integrated with ELK.

4. Samhain

Samhain provides central management that aids in monitoring log files, verifying file integrity, and finding hidden processes.

It has excellent stealth abilities because it can hide itself from intruders, is easy to install, and offers centralised and encrypted monitoring capabilities using TCP/IP connections. Logging for SQL databases, consoles, emails, syslog, Prelude IDS, and other systems is made easier by Samhain.

5. Security Onion

Three elements make up Security Onion: a full packet capture feature, intrusion detection systems that link host-based and network-based events, and a variety of other toolkits like Snort, Bro, Sguil, and Suricata.

If you want to quickly and easily set up a Network Security Monitoring (NSM) platform, Security Onion is the best option for you.

Unfortunately, it does not automatically backup configurations other than rules and does not support Wi-Fi for network management.

Threat Detection Security Tools

A phrase like "threat protection" might refer to a variety of cybersecurity procedures. Now, you need to take into account that every move you make into cybersecurity matters. It comes together as a complete product from the policies you implement to the way you train your personnel and all the way through to the solutions you integrate to safeguard your system, which can be paid, free or open source cybersecurity software.


1. InfraGard

InfraGard, a product of a collaboration between the FBI and a few private sector actors in the USA, is regarded as a component of the Critical Infrastructure. It aids in supplying instruction, information exchange, networking, and workshops on cutting-edge risks and technologies.

2. DHS CISA Automated Indicator Sharing

A capability of the Cybersecurity and Infrastructure Security Agency (CISA), Automated Indicator Sharing (AIS), enables the real-time exchange of machine-readable cyber threat indicators and defensive measures to help safeguard AIS community members and ultimately lessen the prevalence of cyberattacks.

3. Abuse.ch

This non-profit platform manages a few initiatives that assist ISPs and network administrators in actively defending their infrastructure against malware. This is a platform with some authority because abuse.ch provides data that is used by IT security researchers, suppliers, and various federal US agencies in their efforts to make the internet a better and safer place.

4. AlienVault

As a neighbourhood watchdog, Open Threat Exchange serves the international intelligence community. Through open collaboration and sharing of the most recent information regarding new threats, malicious actors, and more, AlienVault enables some private companies, as well as some independent researchers in the field of security and government agencies, to promote security throughout the entire community.

5. BlockList.de

SSH, Mail-Login, FTP, Web Server, and other services are frequently used to attack servers running Blocklist.de.
The specific task is to report all attacks to the relevant abuse departments of the compromised PCs and servers, and to ensure that the accountable provider can notify and alert their clients to the infection.


A tool called a network protocol analyzer is used to track data flow and examine any signals that are intercepted as they pass via communication networks.

1. Wireshark

Security experts can examine the network in detail using Wireshark, which specialises in network protocol analysis, by viewing the traffic, dumping certain packets, examining the packet format, and identifying network problems.

The platform, which supports Windows, Linux, macOS, Solaris, FreeBSD, and NetBSD, enables in-depth analysis of a huge number of protocols. Wireshark enables decryption for numerous protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2. It also supports live data capture and offline data analysis.

A team of volunteers who were searching for a good sniffer on an open-source platform created the answer.

It was formerly known as Ethereal before being renamed Wireshark. In essence, Wireshark is an OS-independent solution that benefits from a user-friendly GUI.

It will work with several capture file formats and read network traffic from all different kinds of transmission protocols, including IEEE 802.11, Bluetooth, USB, Ethernet, and others.

2. httpry

Though it won't analyse the data packets directly, httpry was created as a specialised protocol analyzer for HTTP traffic and can capture and log data for subsequent analysis. Some capabilities of httpry include monitoring user internet requests, determining whether the server configuration is sound, analysing usage trends, scanning for malicious files, etc.


NGREP was first created to identify unusual network connections; however, it later discovered extensions in programmes and eventually evolved into a complete text-only protocol analyzer.

It used to simply support plain-text protocol interactions in the beginning but now supports a variety of protocols.

The most recent upgrade expanded the tool's capabilities, among them the ability to flag particular transactions and support for Solaris IPnet.


Since it can record data packets in a TCP connection and capture them for later analysis and troubleshooting, TCPFLOW was designed particularly for TCP-based connections.
TCPFLOW stores the data into two files by using its ability to distinguish between different data flows based on the direction of the flow.

TCPFLOW has the capacity to exhibit hundreds of thousands of TCP connections concurrently when other similar tools show these transactions in a single connection only.

5. Moloch

Moloch is an example of a protocol analyzer that can process over 10 GB of data per second by storing and indexing data packets in the PCAP format exactly as they were formed. It does this while taking into account the huge data quantities.

Users can use an A node and a threaded C application to capture the data that is being transmitted.

js Elasticsearch is used to power the final processing while the application is operating in the background as a viewer that allows users to see the collected data.

Wrapping Up

Although these free and open source cybersecurity tools for businesses can undoubtedly strengthen a small business's cybersecurity strategy, we think it's crucial to recognise the advantages of a complete cybersecurity solution in terms of efficiency and capabilities.
EDR offers higher endpoint visibility than traditional cybersecurity defence techniques like antivirus and firewalls and enables quicker attack reaction times.

Our E-PDR ecosystem is based on cutting-edge technology that enables continuous prevention through DNS-based attack protection and patching, as well as a fast reaction to advanced cyber attacks of all kinds.


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