llprover
A linear logic prover that searches a cut-free proof for the given two-sided sequent of first-order linear logic.
Automated Reasoning Project
Web resource provided by research group. Includes access to software developed by the team, coverering such projects as FINDER (Finite Domain Enumerator), MaGIC (Matrix Generator for Implication Connectives) and Kripke (A theorem prover for the relevant logic LR).
ModLeanTAP: Lean Tableau-based Deduction for Propositional Modal Logics
Lean Tableau-based Deduction for Propositional Modal Logics. By Bernhard Beckert.
SwitchMin Digital Circuit Minimizer
Tool for minimizing boolean logic functions.
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.
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).
The Coq Project
Deals with effectively machine-checked formal mathematics. In practice, this includes the study of mathematical formalisms well-suited for implementations, the implementations themselves and the use of these for various applications. Focuses on software correctness proofs.
Proof General
Comprehensive Gnu-Emacs and XEmacs interface for several theorem provers including Coq, Isabelle, Lego, and Phox.
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.
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.
Logic Software from CSLI
By Jon Barwise and John Etchemendy.
Database of Existing Mechanized Reasoning Systems
A list (>50 entries) of automatic resolution provers (like Otter), interactive provers (like PVS) and other mechanized reasoning tools.
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.
Visual Turing
A graphical IDE for creating, running and debugging Turing machines. Freeware for Windows 95/98/NT/2000.
Isabelle
A generic theorem proving environment developed at Cambridge University (Larry Paulson) and TU Munich (Tobias Nipkow). Includes logic, documentation and free download.
Paradox
A tool that processes first-order logic problems and tries to find finite-domain models for them; written by Koen Claessen and Niklas Sörensson. Haskell and C++; free download under GPL.
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.
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.
DELORES
A forward-chaining reasoning engine for defeasible logic, a less expressive but more efficient nonmonotonic logic.
Bertrand
First-order satisfiability checker and prover for the Macintosh.
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 reoutines fail.
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.
ProofPower
A suite of tools supporting specification and proof in Higher Order Logic (HOL) and in Z notation.
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.
LWB
Logics Workbench.
Ludwig
Application that draws truth-tables for propositional logic formulae. Available for free download and web use.
Tree Proof Generator
An implementation of the semantic tableaux method for classical propositional and predicate logic, written in JavaScript/DOM.
PROTEIN
A PROver with a Theory Extension INterface. Theorem prover for first-order clause logic, written in ECRC's Prolog-dialect ECLiPSe. Free download, documentation.
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