Logic-related software: Software implement "logic(s)" explicitly. This category includes e.g. automated reasoning systems, theorem provers, self-study software, and their "add-in"s. Both non-commercial and commercial software will be listed.

- ACL2 Version 2.7 A programming language in which you can model computer systems and a tool to help prove properties of those models. Available under GPL and runs on various platforms. Includes related download links.
- Automated Reasoning Project Web resource provided by research group. Includes access to software developed by the team, covering such projects as FINDER (Finite Domain Enumerator), MaGIC (Matrix Generator for Implication Connectives) and Kripke (A theorem prover for the relevant logic LR).
- 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). Subject-identity is supported. User can "step through" the solution algorithm as Bertrand solves a problem, and/or check the graphic tree produced.
- 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.
- 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 decision diagram (BDD).
- Database of Existing Mechanized Reasoning Systems A list (over 50 entries) of automatic resolution provers (like Otter), interactive provers (like PVS) and other mechanized reasoning tools.
- DC Proof Online New proof-writing software to teach the fundamentals of logic and proof. Enables users/students to write error-free proofs by selecting rules of inference, axioms, etc. from convenient drop-down menus. Includes tutorial and exercises.
- Gateway to Logic A collection of web-based logic programs offering a number of logical functions: interactively or automatically build proofs, check theorems, and operate on propositional logic formulae.
- Isabelle A generic theorem proving environment developed at Cambridge University (Larry Paulson) and TU Munich (Tobias Nipkow). Includes logic, documentation and free download.
- 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 artificial intelligence.
- llprover A linear logic prover that searches a cut-free proof for the given two-sided sequent of first-order linear logic.
- Logic Software from CSLI By Jon Barwise and John Etchemendy.
- LOOM A language and environment for constructing intelligent applications. It is a research project in the Artificial Intelligence research group at the University of Southern California's Information Sciences Institute. The goal of the project is to develop and field advanced tools for knowledge representation and reasoning in Artificial Intelligence.
- LWB Logics Workbench.
- MUltlog Takes as input the specification of a finitely-valued first-order logic and produces a sequent calculus, a natural deduction system, and clause formation rules for this logic.
- MUltseq A generic sequent prover for propositional finitely-valued logics.
- Proof General Comprehensive Gnu-Emacs and XEmacs interface for several theorem provers including Coq, Isabelle, Lego, and Phox.
- ProofPower A suite of tools supporting specification and proof in Higher Order Logic (HOL) and in Z notation.
- PVS The PVS Specification and Verification System. Available for Sparc machines with Solaris 2 and Intel x86 Machines with Linux compatible with Redhat 5 or later. Required is Emacs (version 19 or later), recommended LaTeX and Tcl/Tk. Download by FTP.
- Spreadsheet Logic Free Microsoft Excel add-in for processing and evaluating logic in your spreadhseet.
- Tree Proof Generator An implementation of the semantic tableaux method for classical propositional and predicate logic, written in JavaScript/DOM.
- VeriFun A semi-automated system for the verification of statements about programs written in a functional programming language. The system is capable of following fully-automated routines for theorem proving and hypotheses formation, as well as operating interactively when these routines fail.
- 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.

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