Nessus is the world"s most popular vulnerability scanner used in over 75,000 organizations world-wide. Many of the world"s largest organizations are realizing significant cost savings by using Nessus to audit business-critical enterprise devices and applications. The "Nessus" Project was started by Renaud Deraison in 1998 to provide to the internet community a free, powerful, up-to-date and easy to use remote security scanner. Nessus is currently rated among the top products of its type throughout the security industry and is endorsed by professional information security organizations such as the SANS Institute.