Semantic tableau software

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Is it possible to find software to perform semantic tableaus (as described in http://en.wikipedia.org/wiki/Method_of_analytic_tableaux) automatically?

Right now I am proofing it by hand.

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A number of tableau provers for modal logics at least can be found under http://www.cs.man.ac.uk/~schmidt/tools/

You might be interested in LotREC, Logics Workbench, Mettel (resp. its successor Mettel2) or the Tableau WorkBench. These are generic provers and can be used for many logics, but usually come with calculi for propositional logic (and others) predefined.