Open source programming toolkits for modeling table top games
If you're interested in testing the aesthetics and flow of the game (rather than fully automated simulation for balance purposes), then I'd look at Tabletop Simulator.

From their site:


  Tabletop Simulator is the only simulator where you can let your aggression out by flipping the table! There are no rules to follow: just you, a physics sandbox, and your friends. Make your own games and play how YOU want! Unlimited gaming possibilities!