Newton Game Dynamics is an open-source[2] physics engine for realistically simulating rigid bodies in games and other real-time applications.

Its solver is deterministic and not based on traditional LCP or iterative methods.

Newton Game Dynamics is actively developed by Julio Jerez.

Currently a new version which will take advantage of multi-core CPUs and GPUs is being developed.

[3] A list of game engines using Newton Game Dynamics: