Bullet Physics parallel execution Updated +Created
Does not seem to support it unfortunately:
MuJoCo Updated +Created
Was a closed source project by "Roboti LLC", which was then acquired by DeepMind in October 2021 and open sourced March 2022: www.deepmind.com/blog/open-sourcing-mujoco
This library is quite cool. Feel very brutally lean and mean.
PhysX Updated +Created
Had hardware acceleration in mind from the very start, and for a long time that has meant GPU acceleration.