Particle Orbit Visualization
Thamine Dalichaouch has developed an interactive visualization tool for particle orbits in magnetic fields:
http://exodus.physics.ucla.edu/~uclapic/physics185/
This allows users to see basic examples of cyclotron motion, ExB drift, grad-B/curvature drift, Helmholtz mirror, and dipole mirroring, as well as the ability to manually set a variety of parameters.