• There is also the more mature GenIe http://genie.sis.pitt.edu/ with extensive documentation here http://genie.sis.pitt.edu/wiki/GeNIe_Documentation (more mature documentation with more functionality)

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ETA. Oops, forgot to add the above is windows-only. For "other" there is SamIAm http://reasoning.cs.ucla.edu/samiam/, with documentation/tutorials here http://reasoning.cs.ucla.edu/samiam/help/