I have not come across one yet, despite looking for some time.
I resorted to attaching an object to a Spline (Using the spline as a motion path) and baking the Key Frames from the Simulation.
I baked the frames to a Polygon object, and exported into Unity. Naturally, once in Unity edits cant really be made to the animation.
Using Parametric Length as opposed to spacing in Maya allowed me to bake one Keyframe per Spline point allowing for accurate speeding up and slowing down of the object. (So long as you know the time in which it should take for the object to travel along/around the spline.