acl2: acl2 (Computational Logic for Applicative Common Lisp) acl2: acl2: ACL2 is a logic and programming language in which you can model acl2: computer systems, together with a tool to help you prove properties acl2: of those models. "ACL2" denotes "A Computational Logic for acl2: Applicative Common Lisp". ACL2 is part of the Boyer-Moore family of acl2: provers, for which its authors have received the 2005 ACM Software acl2: System Award acl2: acl2: acl2: