Nessus, launched by Tenable in 2002 and headquartered in Columbia, Maryland, is the world's most widely deployed vulnerability scanner. With 50,000+ detection rules and 400+ system checks, it is the essential tool for enterprise vulnerability management.
Burp Suite by PortSwigger is the industry-standard web security testing toolkit, offering intercepting proxy, automated vulnerability scanning, and a rich BApp extension ecosystem covering the complete security testing workflow from manual testing to CI/CD integration.
OpenVAS (Greenbone) is the world's largest open-source vulnerability scanner with over 100,000 NVT test cases, providing automated vulnerability detection, compliance assessment, and penetration testing integration through the GVM framework.