Kali Linux (formerly known as BackTrack Linux) is an open-source, Debian-based Linux distribution aimed at advanced Penetration Testing and Security Auditing.
It is geared towards various information security tasks, such as Penetration Testing, Security Research, Computer Forensics and Reverse Engineering. | All Kali Tools
Nmap allows you to scan your network and discover not only everything connected to it, but also a wide variety of information about what’s connected, what services each host is operating, and so on.
It allows a large number of scanning techniques, such as UDP, TCP connect (), TCP SYN (half-open), and FTP.