Best Free Network Security Software of 2025

OpenVPN offers flexible and scalable solutions that leverage our proven, industry-leading open-source protocol. This technology allows you to segregate traffic and encrypt only the sensitive information, ensuring that you don’t compromise on internet speed or performance while enhancing security. Transitioning to OpenVPN means leaving behind outdated VPN systems and cumbersome hardware that hinder growth. Our advanced VPN technology adapts to your needs, providing robust protection for your business regardless of your team's location—be it a tablet at home, a laptop in a café, or a smartphone at the office.

Control D is a customizable DNS filtering and traffic redirection platform that leverages Secure DNS protocols like DNS-over-HTTPS, DNS-over-TLS and DNS-over-QUIC, with support for Legacy DNS. With Control D you can: block malicious threats, block unwanted types of content network wide (ads & trackers, IoT telemetry, adult content, socials, and more), redirect traffic using transparent proxies and gain visibility on network events and usage patterns, with client level granularity. Think of it as your personal Authoritative DNS resolver for the entire Internet that gives you granular control over what domains get resolved, redirected or blocked.

Unimus is a user-friendly on-premise solution for Network Automation and Configuration Management (NCM) that facilitates quick implementation. This tool enhances network security by offering centralized oversight of configurations and promptly notifying you of any unauthorized alterations through real-time alerts. Its comprehensive API allows seamless integration with SIEM systems, enhancing visibility and aiding security operations. With Compliance Reporting, Unimus ensures that configurations align with internal security standards and meet auditing obligations. The Mass Config Push feature allows for scheduled firmware updates, enabling you to address vulnerabilities across the network efficiently without the need for manual intervention. Compatible with over 400 device types from more than 150 manufacturers, Unimus delivers Network Automation, Change Management, and Configuration Auditing on a vendor-neutral platform. It minimizes the risk of manual errors, bolsters security, and accelerates operational processes, all without requiring any programming expertise.

ManageEngine OpManager serves as a comprehensive network security monitoring tool that allows for the immediate identification of network irregularities and possible security risks. It oversees device settings, records unauthorized modifications, and verifies adherence to established security protocols. Through its proactive alert system, OpManager pinpoints unusual traffic behaviors, identifies potential weaknesses, and highlights performance concerns, facilitating swift action to reduce threats. Additionally, it seamlessly integrates with firewall and intrusion detection systems, boosting overall network security by providing insights into potential attacks and breaches.

EventLog Analyzer from Manage Engine is the industry's most affordable security information and event management software (SIEM). This cloud-based, secure solution provides all essential SIEM capabilities, including log analysis, log consolidation, user activity monitoring and file integrity monitoring. It also supports event correlation, log log forensics and log retention. Real-time alerting is possible with this powerful and secure solution. Manage Engine's EventLog Analyzer allows users to prevent data breaches, detect the root cause of security issues, and mitigate sophisticated cyber-attacks.

Log360 is a SIEM or security analytics solution that helps you combat threats on premises, in the cloud, or in a hybrid environment. It also helps organizations adhere to compliance mandates such as PCI DSS, HIPAA, GDPR and more. You can customize the solution to cater to your unique use cases and protect your sensitive data. With Log360, you can monitor and audit activities that occur in your Active Directory, network devices, employee workstations, file servers, databases, Microsoft 365 environment, cloud services and more. Log360 correlates log data from different devices to detect complex attack patterns and advanced persistent threats. The solution also comes with a machine learning based behavioral analytics that detects user and entity behavior anomalies, and couples them with a risk score. The security analytics are presented in the form of more than 1000 pre-defined, actionable reports. Log forensics can be performed to get to the root cause of a security challenge. The built-in incident management system allows you to automate the remediation response with intelligent workflows and integrations with popular ticketing tools.

Monitor the volume of data your PC is using for every single app, thanks to GlassWire's network monitoring graph. Keep track of the volume of data you received and sent in the past and who or what your PC is talking to. Detect spyware, malware, badly behaving apps, and bandwidth hogs, then block their connections with our powerful firewall. Monitor devices on your network and get alerted when new unknown devices join your WiFi. GlassWire warns you of network-related changes to your PC or unusual changes to your apps that could indicate malware.

NetFlow Analyzer provides real-time visibility to network bandwidth performance and leverages flow technologies. NetFlow Analyzer provides a comprehensive view of your network bandwidth usage and traffic patterns. It has been used to optimize thousands of networks worldwide. NetFlow Analyzer provides a single solution that analyzes, reports, and collects data about your network's bandwidth usage. NetFlow Analyzer can help you optimize bandwidth usage across more than a million interfaces worldwide. It also provides network forensics, network traffic analysis, and network forensics. To gain control over the most used applications, you can reconfigure policies using traffic shaping via ACLs and class-based policies. NetFlow Analyzer uses Cisco NBAR technology to provide deep visibility into Layer 7 traffic. It can also identify applications that use dynamic port numbers, or hide behind known ports.

Secure instant messaging system that works over local networks and the Internet. Collaboration tools for employee engagement.

CacheGuard product line is based on a core product called CacheGuard-OS. Once installed on a bare metal or virtual machine, CacheGuard-OS transforms that machine into a powerful network appliance . The resulted appliance can then be implemented as different types of Gateways to Secure & Optimize your network. See below a brief description of all CacheGuard appliances. - Web Gateway: gain control over the Web traffic in your organization & filter unwanted Web traffic in your organization. - UTM (Unified Threat Management) : secure your networks against all kind of threats coming from the internet with a Firewall, an Antivirus at the Gateway, a VPN server and a Filtering proxy. - WAF (Web Application Firewall): block malicious requests on your critical Web applications and protect your business. The WAF integrates OWASP rules with the possibility to design your own custom rules. In addition, an IP reputation based filtering allows you to block IPs listed in real time blacklists. - WAN Optimizer : prioritize your critical network traffic, save your precious bandwidth and get High Availability for your internet access through multiple ISP.

Cloudflare is the foundation of your infrastructure, applications, teams, and software. Cloudflare protects and ensures the reliability and security of your external-facing resources like websites, APIs, applications, and other web services. It protects your internal resources, such as behind-the firewall applications, teams, devices, and devices. It is also your platform to develop globally scalable applications. Your website, APIs, applications, and other channels are key to doing business with customers and suppliers. It is essential that these resources are reliable, secure, and performant as the world shifts online. Cloudflare for Infrastructure provides a complete solution that enables this for everything connected to the Internet. Your internal teams can rely on behind-the-firewall apps and devices to support their work. Remote work is increasing rapidly and is putting a strain on many organizations' VPNs and other hardware solutions.

Cyberthreats are eradicated Restores confidence. Traditional antivirus is no longer sufficient. Malwarebytes eliminates all new threats before other antivirus systems even know they exist. Malwarebytes blocks viruses, malware, malicious sites, ransomware, hackers, and other threats that traditional antivirus can't stop. Organizations of all sizes use our cutting-edge protection and response strategies. Traditional antivirus is slow to respond to new threats. It's also "dumb". We use layers like anomaly detection (an artificial intelligence type), behavior matching, application hardening, and behavior matching to destroy malware that has never been seen before. It's not like traditional antivirus.

At SafeDNS, we are committed to creating a safer and more secure online environment for SMBs, enterprises, ISPs, MSPs, OEMs, and Education. We have a global footprint, making the internet safer for millions of users in over 60 countries. With years of experience in the field of cybersecurity and DNS filtering, we offer cutting-edge solutions to safeguard your digital life. Our innovative technologies help you stay protected against malware, phishing attacks, inappropriate content, and more. SafeDNS currently serves over 4000 institutions and home users around the world.

Experience a safer internet browsing environment with TunnelBear, which encrypts your connection to safeguard your online activities across any network. Simply launch the TunnelBear application, choose a country, and toggle the switch to activate it. Once connected, TunnelBear operates discreetly in the background, ensuring your data remains protected. Public WiFi networks can be a hotbed for hackers who might steal sensitive information like passwords and personal data; however, TunnelBear effectively mitigates this risk to protect your security. Additionally, internet service providers and network administrators typically have the ability to monitor all your online actions, but with TunnelBear activated, your activities remain hidden from their prying eyes. You may also encounter content that is geographically restricted; TunnelBear can alter your virtual location, granting you access to this content no matter where you are. Furthermore, ad services often utilize your IP address to track your browsing habits, yet TunnelBear prevents this by providing you with a new IP address. In cases where certain governments impose restrictions on popular websites and applications, TunnelBear can seamlessly bypass these barriers by modifying your virtual location, allowing for unrestricted access. This level of privacy and freedom enhances your overall internet experience.

Empower your team to oversee and control the security, efficiency, and management of your complete IT infrastructure through a unified platform, all without any expense to you. The robust ITarian platform offers a streamlined approach to operations, enhances productivity, and optimizes the use of IT resources. Equip your IT personnel with enhanced monitoring and management functionalities. Increase IT efficiency by integrating roles, functions, and tools seamlessly. Ensure maximum uptime through proactive identification and resolution of issues. Streamline daily operations by automating routine tasks using custom scripts, thereby allowing your staff to focus on more strategic initiatives. This holistic approach not only improves workflows but also fosters innovation within your organization.

NextDNS offers comprehensive protection from various security risks, effectively blocking advertisements and trackers across websites and applications while ensuring a secure and monitored online experience for children on all devices and networks. You can assess your security needs and customize your protection by activating over ten different safety measures. By utilizing reliable threat intelligence feeds that contain millions of harmful domains and update constantly, you can enhance your defense mechanisms. Our system goes beyond merely tracking domains; it evaluates DNS queries and responses instantaneously, allowing for the swift identification and prevention of harmful activities. Given that there is often only a brief window of hours from when a domain is registered to when it is used in an attack, our advanced threat intelligence framework is designed to identify malicious domains more efficiently than traditional security methods. Additionally, you can effectively eliminate advertisements and trackers in both websites and applications, including even the most sophisticated ones, by leveraging the most widely used ad and tracker blocklists, which include millions of domains that are refreshed in real-time. Ultimately, NextDNS empowers users with tools to create a safer browsing environment tailored to their specific security needs.

Axence nVision is a comprehensive solution tailored for managing IT infrastructure of any scale. This robust system is equipped with a variety of features essential for effective and smooth IT infrastructure management. It comprises six distinct modules: Network Monitoring, which ensures thorough oversight of the entire IT infrastructure; Inventory, which facilitates quick audits of both hardware and software; User Activity Monitoring; Helpdesk, which offers interactive technical support for IT issues; Dataguard, designed to safeguard against data leaks; and Smarttime, which aids in managing time and assessing employee productivity. Together, these modules create a versatile platform that streamlines IT operations and enhances organizational efficiency.

By collaborating, we can effectively combat cyber attacks at every endpoint, throughout the entire organization, and wherever the conflict unfolds. Cybereason offers unparalleled visibility and precise identification of both familiar and unfamiliar threats, empowering defenders to harness the strength of genuine prevention. The platform supplies comprehensive context and correlations from the entire network, enabling defenders to become skilled threat hunters who can identify covert operations. With just a simple click, Cybereason drastically cuts down the time needed for defenders to investigate and resolve incidents through both automated processes and guided remediation. Analyzing an astounding 80 million events per second, Cybereason operates at a scale that is 100 times greater than many other market solutions. This remarkable capability allows for a reduction in investigation time by as much as 93%, empowering defenders to respond to new threats in mere minutes instead of days. Ultimately, Cybereason redefines the standards of threat detection and response, creating a safer digital landscape for all.

Accelerate the transition from data to tangible business results with Splunk. Splunk Enterprise streamlines the process of gathering, analyzing, and leveraging the hidden potential of the vast data created by your technological framework, security measures, and enterprise applications—equipping you with the knowledge necessary to enhance operational efficiency and achieve business objectives. Effortlessly gather and index log and machine data from a variety of sources. Merge your machine data with information stored in relational databases, data warehouses, as well as Hadoop and NoSQL data repositories. The platform's multi-site clustering and automatic load balancing capabilities are designed to accommodate hundreds of terabytes of data daily, ensuring quick response times and uninterrupted access. Customizing Splunk Enterprise to suit various project requirements is straightforward with the Splunk platform. Developers have the flexibility to create bespoke Splunk applications or incorporate Splunk data into existing applications. Furthermore, applications developed by Splunk, our collaborators, and the community enhance and expand the functionalities of the Splunk platform, making it a versatile tool for organizations of all sizes. This adaptability ensures that users can extract maximum value from their data in a rapidly changing business landscape.

An efficient and rapid antivirus solution ensures comprehensive protection for your computer against various forms of malware, including cryptolockers, screen blockers, banking trojans, adware, spyware, and potentially unwanted programs. During its development, we thoroughly examined contemporary antivirus requirements, leading to a product that effectively fulfills these expectations. NANO Antivirus Sky Scan offers the capability to analyze files using a cloud-based scanner. Furthermore, with NANO Antivirus Sky Scan, users can conveniently manage the NANO Antivirus software on their devices, swiftly access system protection status updates, and view the latest news directly within the application interface. Specifically tailored for touchscreen devices, NANO Antivirus Sky Scan enhances user experience while maintaining robust security. This innovative approach ensures that users can navigate their antivirus features with ease and confidence.

Coro eliminates the need to constantly worry about security tools being overlooked and the security tool overload. There's no need to go through everything 10 times per day. Coro will monitor your security and alert you when you need to act. Coro will analyze the threats to your business and take action to eliminate them. Then, Coro will guide you on the next steps to improve your security. Coro is your central control point for sensitive data and practice data. It allows you to enforce a wide variety of security, compliance, and governance policies. Every email is scanned for malware, phishing, and ransomware, and we automatically eliminate any threats. We automatically detect and block insider threats, account hacking, and other malicious activities. We scan every file, email, and data share for PII/PCI/PHI and prevent confidential information from being leaked.

Website monitoring software that is simple and easy to use. Alerts and real-time status updates for critical web applications and services. Spiceworks is used by thousands of businesses to keep them informed about the status of web applications and services. Spiceworks Connectivity Dashboard is easy to set up. You can install the monitoring agent on any server or workstation, and configure the URLs to start monitoring. Real-time insights are available to spot slow network connections or overwhelmed applications, hosted in your datacenter or in the cloud. This is before they crash or users begin calling. Coming Soon! Email alerts for business critical web applications. Get real-time status for critical apps and devices. You will always have the most up-to-date monitoring information without all the noise. A single, simple-to-use dashboard lets you keep an eye on everything in your realm.

A comprehensive perspective on all potential risks is established through the integration of machine data and contextual analysis, offering Security and Compliance Solutions tailored for contemporary public cloud environments. Cloudnosys implements best practice guidelines to oversee and evaluate your AWS and Azure services, ensuring they adhere to security and compliance standards. With an intuitive dashboard and detailed reports, you will stay updated on any identified risks segmented by region. It is vital to have policy guardrails in place to uphold security and compliance requirements. Swiftly identify and address risks related to your resource configurations, network architecture, IAM policies, and beyond. For example, monitoring publicly accessible S3 and EBS volumes is a critical task you can undertake. This platform ensures comprehensive governance and effective risk management for all cloud assets. In addition, Cloudnosys provides a robust solution for security, compliance, and DevOps automation, meticulously scanning your entire AWS, Azure, and GCP services for any security and compliance breaches. The proactive monitoring capabilities enhance overall cloud security and facilitate the maintenance of best practices across all platforms.

InstaSafe is redefining the challenge of secure access to modern networks by leveraging Zero Trust principles with its security solutions, that ensure seamless access to cloud applications, SAP applications, on-premise data, IoT devices, and multiple other neoteric use cases. InstaSafe discards traditional VPN based conceptions of a network perimeter, instead moving the perimeter to the individual users and the devices they access. The Zero Trust approach followed by InstaSafe mandates a “never trust, always verify' approach to privileged access, without focusing on network locality.

CySight’s revolutionary Actionable Intelligence, trusted by Fortune 500 globally, enables organizations with the most cost-effective and secure way to tackle the increasing density, complexity, and expanse of modern physical and cloud networking. Deploying cyber network intelligence, CySight empowers network and security teams to substantially accelerate incident response by eliminating blindspots, analyzing network telemetry to discover anomalies, uncover cyber-threats, and quantifying asset usage and performance. CySight’s Dropless Collection method enables unsurpassed visibility of network Big-Data which is retained in the smallest footprint, accelerating machine learning, artificial intelligence and automation to fully utilize all metadata no matter the amount, size, or type.