Zenmap is the GUI flavor of nmap tool available in parrot and you can install it in windows also.Zenmap aims to make Nmap easy for beginners to use while giving experienced Nmap users advanced features. Frequently used scans can be saved as profiles to make them easy to run repeatedly. A command creator allows the interactive creation of Nmap command lines. Scan results can be saved and viewed later. Saved scan results can be compared with one another to see how they differ. The results of recent scans are stored in a searchable database.
Start zenmap either from the command line or through the menu. This is the GUI interface to the Nmap scanner. It is solid and works, I prefer the command line as it allows you to script things, collect the output and have more understanding of what's going on. One nice feature of the Zenmap scanner is the graphical map of the scanned networks, a bit of eye candy if nothing else.