General Software and Toolkits. Agent-Based Computational Economics (ACE) and Complex Adaptive Systems (CAS). This site stresses general programming languages and toolkits suitable for agent-based computational economics (ACE) and complex adaptive systems (CAS) modeling. Computational laboratories and interactive demonstration software focused on more specific types of ACE/CAS applications are gathered together at a separate site titled the ACE/CAS Computational Laboratories and Demonstration Software.