Tags: logic, automated theorem proving.
Homepage: http://coq.inria.fr/
Tags: logic, automated theorem proving.
Homepage: http://www4.informatik.tu-muenchen.de/~schulz/WORK/eprover.html
Tags: automated theorem proving.
Homepage: http://proofgeneral.inf.ed.ac.uk/devel
Tags: logic, Z notation, higher-order logic, automated theorem proving.
Homepage: http://lemma-one.com/ProofPower/
Tags: logic, automated theorem proving.
Homepage: http://pvs.csl.sri.com/