Thanks for the link, I hadn't seen p2.js. Here are a few points for comparison: - p2.js is significantly more complete than newton - p2.js uses a rigid body

Thanks for the link, I hadn't seen p2.js. Here are a few points for comparison: - p2.js is significantly more complete than newton - p2.js uses a rigid body simulation closer in principle to box2d, while newton uses a particle-and-constraint based verlet integration - newton provides a game loop with separate render/simulate time tracking (something I feel is missing from existing libs)