Nessus (software)
Nessus is a proprietary vulnerability scanner developed by Tenable, Inc.
History
In 1998 Renaud Deraison created The Nessus Project as a free remote security scanner. On October 5 2005, with the release of Nessus 3, the project changed from the GNU [General Public License] to a proprietary license.The Nessus 2 engine and some of the plugins are still using the GNU General Public License, leading to forks based on Nessus like OpenVAS and Greenbone Sustainable Resilience.