Nessus version 2.2.4 is a free, up-to-date, and full featured remote vulnerability scanner for Linux, BSD, Solaris and other systems. It is multithreaded, plugin-based, has a nice GTK interface, and currently performs over a thousand remote security checks. It has powerful reporting capabilities (HTML, LaTeX, ASCII text) and not only points out problems, but suggests a solution for each of them. Windows version available This is the automated *nix installer.
You can download it from the following link: https://packetstormsecurity.com/files/download/36774/nessus-installer-2.2.4.sh
Source: https://packetstormsecurity.com/files/36774/nessus-installer-2.2.4.sh.html