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Nessus is about power dynamics and the dynamics of abuse, very important themes today in the western world, as we discover we were all abused as kids (and I mean it).
Nessus can be used to investigate the lives of our parents and their relationships to others in the family.
Nessus is like Chiron, only you can add a lot of psychological dynamics, abuse dynamics, and what Melanie Reinhart describes as "the bottom line." Nessus is reminding us of what an abusive world we live in, and now we have something we can do about it.
Nessus 3 will be free of charge for end users or service providers or consultants to do whatever they want with it, except put it into a product or re-brand it as their own software.
Nessus has it's own language for vulnerability checks named NASL and this is something easily picked up by the average use, even non-coders.
Unfortunately, aside from a few public Nessus 2 forks, most of the forks we are tracking or are aware of are by commercial groups who want to start with Nessus 2 to develop commercial scanner, a network monitoring tool or some other function.