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Then Nessus becomes closed source - Golem.de:
The biggest change for Nessus 3, however, is the license. While Nessus has been developed and offered as open source under the GPL so far, version 3 will no longer be published under the GPL. Although the software will continue to be offered for free, even for Windows, the source code will no longer be published.
And a security scanner for which the source is not available is simply nonsense and snake oil. Because tools in the security field urgently need the peer review that is absolutely common for open source software in this area.