PyParticles is an opensource particles simulation tool box entirely wr
...PyParticles as a forces models implements Gravity, spring, constant force and electrostatic and the user defined vector field force.
As a integrations method it includes Euler, Midpoint, Runge Kutta, Störmer Verlet and Leap frog.
The Physicist is a high end physics simulation engine that can provide answers with reasonable accuracies(now w/ rk4 and euler options). It can currently predict the motion of many particles.It Employs OpenGL to provide cutting edge graphics support.