NmapFE is a frontend for the much
loved scanner Nmap. Nmap is a portscanner that is able to do remote OS detection via
TCP/IP fingerprinting as well. You can use Nmap to scan a large network, or a single host.
This frontend provides a simple GUI interface to the complexity of Nmap. The GUI supports
color coding for various services, and enables you to append one scan to the end of
others, to create somewhat of a database of scans. Click here for a full screenshot, or click here to download.