OpenVAS (Open Vulnerability Assessment System) is a spin-off of the famed Nessus scanner, the first version of which dates back to 1998.
It tests for any weak points in a scanned system’s security. Unlike Nessus, OpenVAS is completely open source, with free updates provided by its community. Paid updates, whose availability is guaranteed, and a graphical administration interface can be obtained through the vendor, Greenbone.
It is available under the GPL.
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