Nessus is a security scanner. That is, it's a program which will scan a given network and will seek for vulnerabilities which could be exploited by some remote intruder. The Nessus Project was originally started by Renaud Deraison (deraison@worldnet.fr). Many people contributed in many ways to the project, and the Nessus core team is now made up of Alexis de Bernis (alexisb@mygale.org), who is the Java specialist, Noam Rathaus (dolittle@isrealmail.com) who is in charge of the Nessus client for Windows, and Renaud Deraison who is still here and who is the project leader. WWW: http://www.nessus.org/