MACE is a program that searches for finite models of first-order and equational statements developed at Argonne National Laboratory.

This package includes ANLDP, which calls the propositional decision procedure at the core of MACE directly.

MACE serves as a complementary companion to OTTER, which searches for refutations of the same class of statement. In particular, if you have a first-order conjecture, OTTER will search for a proof, and MACE will search for a counterexample from the same input file.