Nmap was created by Gordon Lyon is a free source network scanner. Nmap is used to find out the host and services by sending packets and analyzing the responses.
The features of nmap for probing computer networks includes host discovery and service and operating systems detection, port scanning, version detection, OS detection, etc.
Nmap was started first as a Linux utility and was ported to other systems like Windows and MacOS.
Download link- https://github.com/nmap/nmap