Best Free Security Monitoring Tools in 2026

All-in-One Network Monitoring Software to stay ahead of IT infrastructure issues.

4.7/5 across G2 and Capterra · 372 ratings, Sep 2026

PRTG Network Monitor is a comprehensive and easy-to-use solution designed to monitor all systems, devices, traffic, and applications within an IT infrastructure. It provides world-class infrastructure monitoring functionality suitable for businesses of all sizes, from SMBs to large enterprises. PRTG helps users know what's up and what's not across their entire network, including databases, applications, cloud services, servers, and local area networks (LANs), utilizing various monitoring methods like SNMP. The software offers multiple user interfaces, including web, desktop, and mobile apps (iOS and Android), for flexible monitoring and management. Users can visualize their network with real-time maps and custom dashboards, and receive alerts and notifications via email, push, or HTTP requests when issues arise or thresholds are exceeded. PRTG is highly flexible and customizable, allowing users to extend its functionality with HTTP API or custom sensors, ensuring it fits diverse monitoring needs and budgets.

Open-source security monitoring

4.5/5 on G2 · 71 ratings, Aug 2026

Wazuh provides open-source security monitoring. SIEM, threat detection, and compliance-enterprise security without enterprise cost. The open-source model is powerful. The features are comprehensive. The community is active. Organizations wanting open-source security platform choose Wazuh for free SIEM.

Comprehensive security monitoring and vulnerability scanning for your digital assets.

Cotool Security offers a suite of tools designed to enhance the security posture of organizations by providing continuous monitoring and proactive vulnerability management. It aims to identify and address security weaknesses across various digital assets, including web applications, networks, and cloud infrastructure. The platform is typically geared towards small to medium-sized businesses, developers, and IT security professionals who need an accessible yet robust solution to manage their cybersecurity risks. By automating the detection of vulnerabilities and offering insights into potential threats, Cotool Security helps users maintain compliance and protect sensitive data without requiring extensive in-house security expertise.

Free threat intelligence platform for researching and sharing security threat data.

IBM X-Force Exchange is a cloud-based threat intelligence sharing platform for researching global security threats, aggregating actionable intelligence, and collaborating with peers. Registered users get access to search, commenting, collections and sharing functionality, and the platform also exposes a threat intelligence API for programmatic access. It is built for security researchers, threat analysts and SOC teams who want to look up indicators of compromise, malware and vulnerability information, and share findings with other users of the platform. Note: IBM's separately licensed X-Force Exchange Threat Intelligence data feed (bundled with certain IBM security products such as QRadar) is being retired during 2026 as part of IBM's QRadar divestiture to Palo Alto Networks; the public X-Force Exchange research and collaboration platform itself remained live as of this listing.

Spot AI attacks with decoys, prompt-injection defense, and tamper-evident logs

CanaryVaults is deception-based security for AI apps. It plants decoy email identities, fake-but-plausible trap facts in your RAG documents, and honeypot AI endpoints. When an attacker or a leaky pipeline touches one, you get an alert with the evidence. It also includes a prompt-injection firewall that sits in front of your model and a tamper-evident log of what your agents did. There is a free plan with no card.