Some of these tools are ACL, HOL , Isabelle, Otter, ProofPower, ZETA, CZT, Spin, NuSMV, BLAST, and Alloy. 저는 ACL, Otter, Spin, BitC, Alloy가 특히 흥미롭다고 생각하는데, 각기 다른 이유가 있긴 하지만요. In contrast, few high assurance components are FLOSS.