Zenmap is the official cross-platform GUI for the Nmap Security Scanner. It is free and runs on Linux, Windows, Mac OS X, etc. Developed by Gordon Lyon
License: Open Source
Zenmap is a powerful open-source tool that excels in network scanning and customization through scripting, making it ideal for users who prefer flexibility. In contrast, Nsauditor Network Security Auditor is a comprehensive commercial solution with robust vulnerability scanning and reporting features, suitable for organizations needing a straightforward and efficient security audit tool.