Spread*** allowing to use fuzzy logic

It is nice to explore ideas using what-if scenarios and using the spread*** type of human interface.
I have looked with google, but I cannot find anything. Maybe I did not look well. I apologize if this seems trivial or a waste of time for the pros.
Is there any spread*** using fuzzy logic? is there any fuzzy logic extension for something like excel?

Failing all of the above, is there any easy to use toolkit with spread*** type of objects that can easily be integrated with fuzzy logic?
I am a decent programmer for command line, non graphical, applications, in C and C++. I am rather inexperienced in anything involving graphics and MFC. I am ready to study if there is something that is usable. I do not mind to buy books, if they provide detailed information.

Thank you

Pablo

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