PatrolServer!

The Nessus vulnerability scanner is the world-leader in active scanners, featuring high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. Nessus scanners can be distributed throughout an entire enterprise, inside DMZs and across physically separate networks.

Burp Suite is an integrated platform for performing security testing of web applications. Its various tools work seamlessly together to support the entire testing process, from initial mapping and analysis of an application's attack surface, through to finding and exploiting security vulnerabilities.

Audit your website security and web applications for SQL injection, Cross site scripting and other web vulnerabilities with Acunetix Web Security Scanner. Download Free Edition!

Netsparker is the only False-positive-free web application security scanner. Simply point it at your website and it will automatically discover the flaws that could leave you dangerously exposed.

Websecurify is a powerful web application security testing environment designed from the ground up to provide the best combination of automatic and manual vulnerability testing technologies.

SCAP is a line of standards managed by NIST. It was created to provide a standardized approach to maintaining the security of enterprise systems, such as automatically verifying the presence of patches, checking system security configuration settings, and examining systems for signs of compromise.

Detectify is a SaaS based web application service that analyzes the security status of your website and creates a report with the results. We focus on securing your site so that you can build awesome products and services!

Find your vulnerabilities before others do. Schedule vulnerability scans for your servers and get notified when it's time to call your admin.

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 in your corporate network, it tells you by colored icons specific security bulletin rating ( critical, important, moderate ), title, description and bulletin URL. The tool is designed with a user-friendly interface and is easy to use. »

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

The goal of cvechecker is to report about possible vulnerabilities on your system, by scanning the installed software and matching the results with the CVE database. Indeed, this is not a bullet-proof method and you will most likely have many false positives (vulnerability is fixed with a revision-release, but the tool isn't able to detect the revision itself), yet it is still better than nothing, especially if you are running a distribution with little security coverage.

Tinfoil Security provides a simple website application security solution by routinely monitoring and checking for vulnerabilities using a constantly updated scanner.