breve

breve is a simulation environment which allows users to define the behaviors and interactions of different types of agents in a simulated 3D world and observe the emergent behaviors. breve is conceptually similar to packages such as Swarm and StarLogo, but simulates objects in a continuous 3D world with continuous time. breve thus allows simulation involving realistic collision detection and physics.

Agent behaviors are written in a simple object oriented language called "steve". Users define an agent's behavior by specifying how the agent interacts with the world at each timestep and how the agent interacts when it
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Version 2.7.2 release notes.

Requirements

Mac OS X 10.1 or later