Nessus is a software tool designed to identify system vulnerabilities through automated point-in-time assessments. It is capable of detecting software defects, missing patches, malware, and misconfigurations across a wide range of operating systems, devices, and applications.

Snort® is an open source network intrusion prevention and detection system (IDS/IPS) developed by Sourcefire. Combining the benefits of signature, protocol, and anomaly-based inspection, Snort is the most widely deployed IDS/IPS technology worldwide.

Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 6400 potentially dangerous files/CGIs, checks for outdated versions of over 1000 servers, and version specific problems on over 270 servers.

A fully automated, active web application security reconnaissance tool. Key features: High speed: pure C code, highly optimized HTTP handling, minimal CPU footprint - easily achieving 2000 requests per second with responsive targets.

Intruder is a security monitoring platform for internet-facing systems.

Intruder provides an easy to use security solution which continually scans your digital assets, highlighting vulnerabilities and outlining remediation advice in simple terms.

Network Hotfix Scanner is a free advanced hotfix check utility that scans network computers for missing hotfixes and patches, and helps you download and install them. NetHotfixScanner gives you a quick look at the hotfixes and patches installed or missed on any remote computer...

TEQNIX is a platform with a number of tools and strategies for penetration testers, red teamers and secops. It promotes automation with scanners and utilities and also assist in a real-time attack situation.

Mageni provides a free, open-source and enterprise-ready cybersecurity vulnerability management solution.