zoe

ZOE is a trivial OpenGL graphics engine, written entirely in
    Python.  It's primary focus is rapid prototyping and
    experimentation, so it only supports the barest essentials, with
    focus on wire frames.  Special emphasis is placed on particle
    systems (where non-interacting particles follow simple rules).

    Some familiarity with OpenGL is expected, although when exploiting
    the particle system abstractions no specific OpenGL knowledge is
    required.

    Demos included are the obligatory spinning polyhedra, static views
    of conic sections and the Solar System, a 3D surface plotter, a
    fountain of sparks, a swarming behavior model, a random walk
    example, a whirpool effect using gravity and drag, and an example
    of chaos theory and sensitivity to initial conditions.