Tenable's Nessus is a very popular vulnerability assessment tool and has been around for almost two decades. Nessus can accessed with an annual subscription; however, the good folks at Tenable have made Nessus Professional available as a 7-day trial for those that may wish to try it.
Before we install Nessus, you may wish to take note of the version of Kali Linux that you are running, to ensure that you download the appropriate version of Nessus.
To do this, simply type uname –a in a Terminal, as follows:

In this screenshot, we can see that I am using the 64-bit version (amd64) of Kali Linux based on Debian. As such, I will need to download the 64-bit version for Debian builds.