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3TAP

Many-valued tableau-based theorem prover developed at the University of Karlsruhe. It can be instantiated for arbitrary finitely-valued first-order logics, and it can handle equality (two-valued), sorts, and non-clausal input.
(http://i12www.ira.uka.de/~threetap/)

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.
(http://www.cs.utexas.edu/users/moore/acl2/)

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).
(http://cslab.anu.edu.au/ar/)

Bertrand

First-order satisfiability checker and prover for the Macintosh.
(http://www.humnet.ucla.edu/humnet/phil/grads/herzberg/Bertra)

Church

Program understands the different types of lambda expressions, can extract lists of variables (both free and bound) and subterms, and can simplify complicated by expression by means of application. Uses Python.
(http://www.alcyone.com/pyos/church/)

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.
(http://www-formal.stanford.edu/clt/ARS/systems.html)

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.
(http://logik.phl.univie.ac.at/~chris/formular-uk.html)

Isabelle

A generic theorem proving environment developed at Cambridge University (Larry Paulson) and TU Munich (Tobias Nipkow). Includes logic, documentation and free download.
(http://www.cl.cam.ac.uk/Research/HVG/Isabelle/)

llprover

A linear logic prover that searches a cut-free proof for the given two-sided sequent of first-order linear logic.
(http://bach.scitec.kobe-u.ac.jp/llprover/)

Logic Software from CSLI

By Jon Barwise and John Etchemendy.
(http://www-csli.stanford.edu/hp/Logic-software.html)

Logic.xla

Creates truth tables, if-then, and if-and-only-if processor.
(http://qfsys.com/Jim/iffproof.htm)

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.
(http://www.isi.edu/isd/LOOM/LOOM-HOME.html)

Ludwig

Application that draws truth-tables for propositional logic formulae of any complexity and amount of variables. Available for free download and web use.
(http://calle69.net/~dap/ludwig/)

LWB

Logics Workbench.
(http://www.lwb.unibe.ch/)

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.
(http://www.logic.at/multlog/)

MUltseq

A generic sequent prover for propositional finitely-valued logics.
(http://www.logic.at/multseq/)

ProofGeneral

Comprehensive Gnu-Emacs and XEmacs interface for several theorem provers (currently, Coq, Isabelle, Lego, and Phox).
(http://www.proofgeneral.org/)

ProofPower

A suite of tools supporting specification and proof in Higher Order Logic (HOL) and in Z notation.
(http://www.lemma-one.com/ProofPower/index/)

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.
(http://www.uni-koblenz.de/ag-ki/Implementierungen/Protein/)

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.
(http://pvs.csl.sri.com/)

SAT Hard Instance Generator and Solution Algorithms

Utilities and algorithms by V. Z. Nuri.
(http://www8.pair.com/mnajtiv/sat/sat.html)

SwitchMin Digital Circuit Minimizer

Tool for minimizing boolean logic functions.
(http://incolor.inetnebr.com/double/softlib/switchmin.html)

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.
(http://pauillac.inria.fr/coq/)

Theorem Provers

A list of (well-known) theorem provers on logic-server at the university of Muenchen. Good point to start.
(http://www.tcs.informatik.uni-muenchen.de/~matthes/logikserv)

Tree poof generator

An implementation of the semantic tableaux method for classical propositional and predicate logic, written in JavaScript/DOM.
(http://www.umsu.de/logik/trees)

Visual Turing

A graphical IDE for creating, running and debugging Turing machines. Freeware for Windows 95/98/NT/2000.
(http://www.cheransoft.com/vturing/)

WinKE: A Proof Assistant for Teaching Logic

WinKE is 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://www.dcs.kcl.ac.uk/staff/endriss/WinKE/)

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