MapleSim 6.1 offers a modern approach to physical modeling and simulation, reducing model development and analysis time while producing fast, high-fidelity simulations. Improvements to the simulation engine mean that MapleSim can produce simulations faster than ever before. In addition, the MapleSim Application Programming Interface (API), a collection of procedures for manipulating, simulating and analyzing a MapleSim model in the Maple document environment, has been expanded to provide more flexibility for model creation and analysis.