Hydroelectric Dams: Water gets pulled down by gravity, goes through giant turbine, and voila, electricity. Cuckoo clocks: Weight pulls down gears and stuff to move the pendulum. Once it hits the ground, no more clock. read more
In terms of power, i.e. rate of energy production, the biggest use is generating electricity from the energy of water moving toward lower altitude, which turns turbines while gravitating toward lower gravitational potential energy. read more
Anything that uses the force of a falling object to do work. For example, water mills, hydroelectric power generators, pile drivers. read more