[lamontcg]

Everything else is going to be small and average out over time. And if you manage to pick up a bit of energy orbiting a tiny object you'll quickly just get ejected at its (small) escape velocity. Whatever that gives you, it won't be worth the cost of matching orbits to start with. Better to come in hot and slingshot.

Solar wind / radiation pressure is probably the next best free ride since that adds up over time continuously and is everywhere.