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Proof General Comprehensive Gnu-Emacs and XEmacs interface for several theorem provers including Coq, Isabelle, Lego, and Phox. http://proofgeneral.inf.ed.ac.uk Ed.ac.uk  ~   Site Info   Whois   Trace Route   RBL Check   Church Program understands the different types of lambda expressions, can extract lists of variables (both free and bound) and subterms, and can simplify complicated expressions. Uses Python. http://www.alcyone.com/software/church/ Alcyone.com  ~   Site Info   Whois   Trace Route   RBL Check   WinKE An interactive proof assistant based on analytic tableaux, and designed for the teaching of deductive reasoning. Ordering information is available at this site, as are academic papers on the design of the software. http://staff.science.uva.nl/~ulle/WinKE/ Uva.nl  ~   Site Info   Whois   Trace Route   RBL Check   ModLeanTAP: Lean Tableau-based Deduction for Propositional Modal Logics Lean Tableau-based Deduction for Propositional Modal Logics. By Bernhard Beckert. http://i12www.ira.uka.de/modlean/ Uka.de  ~   Site Info   Whois   Trace Route   RBL Check   CrocoPat: Simple and Efficient Relational Programming CrocoPat manipulates relations of any arity, including graphs (which are binary relations). Its simple and expressive query and manipulation language is based on first-order predicate calculus. The implementation is based on the data structure binary dec http://mtc.epfl.ch/~beyer/CrocoPat/ Epfl.ch  ~   Site Info   Whois   Trace Route   RBL Check   Bertrand Bertrand solves sets of first-order predicate logic statements for satisfiability (consistency), validity, and equivalence. It also checks single statements for "logical truth" (tautology) and "logical falsity" (self-contradiction). http://www.uwosh.edu/faculty_staff/herzberg/Bertrand.html Uwosh.edu  ~   Site Info   Whois   Trace Route   RBL Check   j'Imp Theorem Prover An automatic theorem prover based on set of support and ordered resolution for first-order logic. j'Imp is part of the Orbital library. This library is a Java class providing object-oriented representations and algorithms for logic, mathematics, and art http://www.functologic.com/logic/jImp.html Functologic.com  ~   Site Info   Whois   Trace Route   RBL Check   Spreadsheet Logic Free Microsoft Excel add-in for processing and evaluating logic in your spreadhseet. http://members.lycos.co.uk/jbusar/ Lycos.co.uk  ~   Site Info   Whois   Trace Route   RBL Check